Cop \Cop\ (k[o^]p), n. [AS. cop; cf. G. kopf head. Cf. Cup, Cob.]

1. The top of a thing; the head; a crest. [Obs.]

Cop they used to call The tops of many hills. --Drayton.

2. A conical or conical-ended mass of coiled thread, yarn, or roving, wound upon a spindle, etc.

3. A tube or quill upon which silk is wound.

4. (Mil. Arch.) Same as Merlon.

5. A policeman. [Slang]

Cop waste, a kind of cotton waste, composed chiefly of remnants of cops from which the greater part of the yarn has been unwound.

Source: Webster's Revised Unabridged Dictionary (1913)