PISTON n.
o the piston rod. -- Piston rod, a rod by which a piston is moved, or by which it communicates motion. -- Piston valve (Steam Eng.), a slide valve, consisting of a piston, or connected pistons, working in a cylindrical case which is provided with ports that are traversed by the valve.
POINT n.
That which arrests attention, or indicates qualities or character; a salient feature; a characteristic; a peculiarity; hence, a particular; an item; a detail; as, the good or bad points of a man, a horse, a book, a story, etc. He told him, point for point, in short and plain. Chaucer. In point of religion and in point…