What does "swiftlet" mean?

Any of the various tropical and subtropical birds of the four genera Aerodramus, Hydrochous, Schoutedenapus, and Collocalia in the swift family, many of which can navigate in darkness using echolocation.

What is a synonym for "swiftlet"?

Common synonyms include: collocalia inexpectata, swift, swift.

Swiftlet

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
Any of the various tropical and subtropical birds of the four genera Aerodramus, Hydrochous, Schoutedenapus, and Collocalia in the swift family, many of which can navigate in darkness using echolocation.
2
swift of eastern Asia; produces the edible bird's nest wordnet