transferred. The spiral ridge winding round the shank of a screw; also, each complete turn of this; a similar ridge round the inside of a…

Used as the name of various implements of spiral form. (Supposed to resemble the sinuous shape and… The thread or spiral ridge of a male screw.

the helical ridge of a screw.

In various technical uses. A raised rim or ridge on any surface, esp. ‘a ring on the muzzle and cascabel of a gun’ (Adm. Smyth); also, the thread…