Library / English Dictionary

AIR SAC

Pronunciation (US):

(GB):

 I. (noun) 

Sense 1

Meaning:

Any of the membranous air-filled extensions of the lungs of birds

Classified under:

Nouns denoting animals

Hypernyms ("air sac" is a kind of...):

sac (a structure resembling a bag in an animal)

Holonyms ("air sac" is a part of...):

bird (warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wings)

Sense 2

Meaning:

Any of the thin-walled extensions of the tracheae of insects

Classified under:

Nouns denoting animals

Hypernyms ("air sac" is a kind of...):

sac (a structure resembling a bag in an animal)

Holonyms ("air sac" is a part of...):

insect (small air-breathing arthropod)

Sense 3

Meaning:

A tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways

Synonyms:

air cell; air sac; alveolus

Classified under:

Nouns denoting body parts

Hypernyms ("air sac" is a kind of...):

sac (a structure resembling a bag in an animal)

Holonyms ("air sac" is a part of...):

lung (either of two saclike respiratory organs in the chest of vertebrates; serves to remove carbon dioxide and provide oxygen to the blood)

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