cowl (n.)

"hood attached to a gown or robe, chiefly worn by monks and characteristic of their profession; a hooded garment," Middle English coule, from Old English cule, from earlier cugele, from Late Latin cuculla "monk's cowl," variant of Latin cucullus "hood, cowl," which is of uncertain origin. As "covering (originally cowl-shaped) for the top of a chimney or vent-pipe" by 1812. Hence cowling for "removable engine cover," 1917, originally in reference to aircraft.

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Definitions of cowl from WordNet
cowl (n.)
protective covering consisting of a metal part that covers the engine;
the mechanic removed the cowling in order to repair the plane's engine
Synonyms: hood / bonnet / cowling
cowl (n.)
a loose hood or hooded robe (as worn by a monk);
cowl (v.)
cover with or as with a cowl;
cowl the boys and veil the girls