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- HELIXA curve on the surface of a cylinder or cone such that its angle to a plane perpendicular to the axis is constant; the three-dimensional curve seen in a screw or a spiral staircase
- OZONEAn allotrope of oxygen (symbol O₃) having three atoms in the molecule instead of the usual two; it is a toxic gas, generated from oxygen by electrical discharge.
- TAXIDERMYThe art of stuffing and mounting the skins of dead animals for exhibition in a lifelike state.