air sac
English Dictionary
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Letter A
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air sac Definition
(n)
a
tiny
sac
for
holding
air
in
the
lungs
;
formed
by
the
terminal
dilation
of
tiny
air
passageways
(n)
any
of
the
thin
-
walled
extensions
of
the
tracheae
of
insects
(n)
any
of
the
membranous
air
-
filled
extensions
of
the
lungs
of
birds
air sac Synonyms
air cell
air sac
alveolus
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