RECIPROCATE v.
interchangeably; to alternate. One brawny smith the puffing bellows plies, And draws and blows reciprocating air. Dryden. Reciprocating engine, a steam, air, or gas engine, etc., in which the piston moves back and forth; -- in distinction from a rotary engine, in which the piston travels continuously in one direction…
SCREW n.
- Screw worm (Zoöl.), the larva of an American fly (Compsomyia macellaria), allied to the blowflies, which sometimes deposits its eggs in the nostrils, or about wounds, in man and other animals, with fatal results. -- Screw wrench. (a) A wrench for turning a screw. (b) A wrench with an adjustable jaw that is moved by…