Showing 2,401 to 2,500 of 3,037.
- PSYLLIUMAny of several plants of Plantago subg. Psyllium.
- PTARMICA substance, such as pepper or snuff, that causes sneezing.
- PTERICRelating to a wing.
- PTERIONThe point corresponding with the posterior end of the sphenoparietal suture; known as the weakest part of the skull.
- PTERODACTYLA pterosaur of the genus Pterodactylus.
- PTEROIDA bone, found only in pterosaurs, that connected to the wrist to support the propatagium.
- PTEROPODAny of free-swimming pelagic sea snails and sea slugs, of the suborder Thecosomata, that have winglike lobes on the feet; a sea butterfly.
- PTERYGIUMAn abnormal mass of tissue in the corner of the eye that obstructs vision.
- PTERYGOIDOf, pertaining to or lying in the region of the inferior part of the sphenoid bone of the vertebrate skull.
- PTERYLAOne of the areas of a bird's skin on which feathers grow.
- PTISANAlternative spelling of tisane.
- PTOMAINEAny of various amines formed by putrefactive bacteria.
- PTOSISThe prolapse of a bodily organ, especially drooping of the eyelid or the breasts.
- PTUIThe sound of spitting.
- PTYALINA form of amylase found in saliva that breaks down starch into maltose and dextrin.
- PTYALISMsialorrhea
- PTYALIZETo spit.
- PTYXISThe way in which an individual leaf is folded in the bud.
- PUMPKINA domesticated plant, in species Cucurbita pepo, similar in growth pattern, foliage, flower, and fruit to the squash or melon.
- PURPLEA colour between red and blue; violet, though often closer to magenta.
- PURSEA small bag for carrying money.
- PYAEMIAA type of septicemia caused usually by the presence of Staphylococcus bacteria in the bloodstream; characterised by metastatic abscesses and other symptoms associated with septicem
- PYCNITEA variety of fine-grained topaz.
- PYCNOMETERA vessel of precisely known volume used by weighing to determine the specific gravity or relative density of a liquid.
- PYLONA gateway to the inner part of an Ancient Egyptian temple.
- PYLORUSIn vertebrates, including humans, a zone at the lower end of the stomach that leads to and opens into the duodenum.
- PYRAMISA pyramid.
- PYREA funeral pile; a combustible heap on which corpses are burned.
- PYRETICCaused by, pertaining to or resulting in fever.
- PYREXIAFever.
- PYRITEThe common mineral iron disulfide (FeS2), of a pale brass-yellow color and brilliant metallic luster, crystallizing in the isometric system.
- PYROA pyromaniac.
- PYROLUSITEA dark coloured mineral, consisting of manganese dioxide (MnO2), that is an important ore of manganese.
- PYROXENEAny of a group of crystalline minerals containing silicates of iron, magnesium and calcium.
- PYTHONAny of the family Pythonidae of nonvenomous constrictor snakes.
- PYXIDIUMA seed capsule in the form of a box, the seeds being released when the top splits off.
- QUADRIPLEGIAParalysis from the neck down.
- QUADRIPLEGICOf, related to, or suffering from quadriplegia.
- QUALITYThe kind, condition, and/or the set of characteristics of something, as opposed to the quantity of something.
- QUINCEThe pear-shaped fruit of a small tree of the rose family, Cydonia oblonga.
- QUINSYA peritonsillar abscess; a painful pus-filled inflammation or abscess of the tonsils and surrounding tissues, usually a complication of tonsillitis, caused by bacterial infection a
- RACHISThe spinal column, or the vertebrae of the spine.
- RACHITISRickets.
- RAPHEA seamlike ridge or furrow on an organ, bodily tissue, or other structure, typically marking the line where two halves or sections fused in the embryo. The connecting ridge between
- RAPHIDEA crystal of calcium oxalate, shaped like a needle, which forms as a metabolic byproduct in some plant cells.
- RAVAGETo devastate, destroy or lay waste to something.
- REGOLITHThe layer of loose rock, dust, sand, and soil, resting on the bedrock, that constitutes the surface layer of most dry land on Earth, the Moon, and other large solid aggregated cele
- RETINAThe thin layer of cells at the back of the eyeball that contains rods and cones sensitive to light, which trigger nerve impulses that pass via the optic nerve to the brain, where a
- RETINOIDPertaining to or resembling a resin.
- RHABDOMANCIESDivination with wands or rods, especially to use a divining rod to find things below the ground.
- RHABDOMANCYDivination with wands or rods, especially to use a divining rod to find things below the ground.
- RHABDUSA simple, straight spicule.
- RHAPONTICThe false rhubarb (Rheum rhaponticum)
- RHAPSODEOne who performs the poetry of a poet for an audience; not necessarily a writer of poetry.
- RHAPSODIChighly emotional; rapturous
- RHEAA large flightless bird of the order Rheiformes, native to South America.
- RHEMATICThe provision of new information regarding the current theme.
- RHEMEThe part of a sentence that provides new information regarding the current theme.
- RHEOLOGYThe branch of physics that studies the deformation and flow of matter.
- RHESUSA macaque monkey native to southern and southeastern Asia; Macaca mulatta.
- RHETORA rhetorician.
- RHETORICALPart of or similar to rhetoric, the use of language as a means to persuade.
- RHEUMThin or watery discharge of mucus or serum, especially from the eyes or nose, formerly thought to cause disease.
- RHEUMATICResembling or relating to rheumatism.
- RHEUMATOLOGIESThe branch of medicine specializing in arthritis and other ailments of the joints.
- RHEUMATOLOGYThe branch of medicine specializing in arthritis and other ailments of the joints.
- RHEXISThe rupture of an organ.
- RHINOCEROSAny large herbivorous ungulate mammal native to Africa and Asia of the family Rhinocerotidae, with thick, gray skin and one or two horns on their snouts.
- RHIZINEA rootlike filament or hair growing from the stems of mosses or on lichens; a rhizoid
- RHIZOMEA horizontal, underground stem of some plants that sends out roots and shoots (scions) from its nodes.
- RHODIUMA rare, hard, silvery-white, inert metallic chemical element (symbol Rh) with an atomic number of 45.
- RHODONITEA manganese inosilicate mineral with some substitution by iron and magnesium, of composition (Mn,Fe,Mg,Ca)SiO3.
- RHODOPSINA light-sensitive pigment in the rod cells of the retina; it consists of an opsin protein bound to the carotenoid retinal
- RHOEADINEAny of a group of benzazepine alkaloids found in the poppy.
- RHOMBA rhombus.
- RHOMBOSA musical instrument used in ancient mystical ceremonies, whirled to producing a roaring sound.
- RHOMBUSA parallelogram having all sides of equal length. The rhombus diamond, as one of the suits seen in a deck of playing cards ( or ).
- RHONCHUSA dry rattling sound heard during breathing, due to deposits in the bronchial tubes.
- RHOPALICHaving each successive word longer by a letter or syllable.
- RHOTACISMAn exaggerated use of the sound of the letter R.
- RHUMBA line which crosses successive meridians at a constant angle.
- RHYOLITEAn igneous, volcanic (extrusive) rock, of felsic composition, with aphanitic to porphyritic texture.
- RHYTIDOMEThe dead layers of plant bark (undergoing or having undergone secondary growth) external to that of the last formed periderm .
- RHYTONA container from which fluids are intended to be drunk, having one handle and usually a base in the form of a head.
- ROTLAlternative form of rottol: a former Middle Eastern and North African unit of weight, usually 1–5 pounds (0.5–2.5 kg).
- RUMPThe hindquarters of a four-legged mammal, not including its legs
- RUPIAAn ulcer due to syphilis.
- SACRUMA large triangular bone at the base of the spine, located between the two ilia (wings of the pelvis) and formed from vertebrae that fuse in adulthood.
- SALPAny of the free-swimming tunicates of the order Salpida and its single family Salpidae.
- SALPAAlternative form of salp.
- SAMPIThe obsolete Greek letter Ϡ (S), ϡ (s).
- SANDALA type of open shoe made up of straps or bands holding a sole to the foot
- SANDARACRealgar; red sulphide of arsenic.
- SANDEKA person honoured at a Jewish brit milah by holding the baby boy in his lap as the mohel performs the circumcision.
- SANTURA type of hammered dulcimer played in Persian music
- SAPROPELAn aquatic sludge-like sediment rich in organic matter formed in oxygen-free areas at the bottom of lakes, seas etc.
- SARCOMAA type of malignant tumor of the bone, cartilage, fat, muscle, blood vessels, or other connective or supportive tissue.
- SARDINEAny one of several species of small herring which are commonly preserved in olive oil or in tins for food, especially the pilchard, or European sardine (Sardina pilchardus, syn. Cl
- SARDONICScornfully mocking or cynical.
- SARDONYXA gemstone having bands of red sard; a variety of onyx or chalcedony.