Definition of swifts:
(adj) :
Fast; quick; rapid.
(adj) :
Capable of moving at high speeds.
(n) :
A small plain-colored bird of the family Apodidae that resembles a swallow and is noted for its rapid flight.
(n) :
(entomology) Any of various fast-flying hesperiid butterflies.
(n) :
Any of certain lizards of the genus Sceloporus.
(n) :
(entomology) A moth of the family Hepialidae, swift moth, ghost moth.