Cowl \Cowl\ (koul), n. [AS. cuhle, cugle, cugele; cf. dial. G. kogel, gugel, OF. coule, goule; all fr. LL. cuculla, cucullus, fr. L. cucullus cap, hood; perh. akin to celare to conceal, cella cell. Cf. Cucullate.]

1. A monk's hood; -- usually attached to the gown. The name was also applied to the hood and garment together.

What differ more, you cry, than crown and cowl? --Pope.

2. A cowl-shaped cap, commonly turning with the wind, used to improve the draft of a chimney, ventilating shaft, etc.

3. A wire cap for the smokestack of a locomotive.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Cowl \Cowl\, n. [Cf. OF. cuvele, cuvel, dim. of F. cuve tub, vat, fr. L. cupa. See Cup.]

A vessel carried on a pole between two persons, for conveyance of water. --Johnson.

Source: Webster's Revised Unabridged Dictionary (1913)