Screw-axis
noun, Crystallography.
1.
a symmetry element of a space group such that a rotation of the lattice about the axis and a translation of the lattice some fraction of the lattice’s unit distance brings the lattice back to its original position.
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noun 1. a device for moving loose materials, consisting of a shaft with a broad, helically wound blade rotating in a tube or trough. screw conveyor noun 1. (engineering) a duct along which material is conveyed by the rotational action of a spiral vane which lies along the length of the duct Also called worm […]
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noun 1. a hand tool for turning a screw, consisting of a handle attached to a long, narrow shank, usually of metal, which tapers and flattens out to a tip that fits into the slotted head of a screw. 2. a mixed drink made with vodka and orange juice. noun 1. a tool used for […]