From WordNet (r) 3.0 (2006):
cap
n 1: a tight-fitting headdress
2: a top (as for a bottle)
3: a mechanical or electrical explosive device or a small amount
of explosive; can be used to initiate the reaction of a
disrupting explosive [syn: detonator, detonating device,
cap]
4: something serving as a cover or protection
5: a fruiting structure resembling an umbrella or a cone that
forms the top of a stalked fleshy fungus such as a mushroom
[syn: cap, pileus]
6: a protective covering that is part of a plant [syn: hood,
cap]
7: an upper limit on what is allowed; "he put a ceiling on the
number of women who worked for him"; "there was a roof on
salaries"; "they established a cap for prices" [syn:
ceiling, roof, cap]
8: (dentistry) dental appliance consisting of an artificial
crown for a broken or decayed tooth; "tomorrow my dentist
will fit me for a crown" [syn: crown, crownwork,
jacket, jacket crown, cap]
9: the upper part of a column that supports the entablature
[syn: capital, chapiter, cap]
v 1: lie at the top of; "Snow capped the mountains" [syn: cap,
crest]
2: restrict the number or amount of; "We had to cap the number
of people we can accept into our club"