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Webster 1913 Edition
Pinna
‖
Pin′na
,Noun.
pl.
Pinnæ
(#)
, E. Pinnas
(#)
. [L., a feather.]
1.
(Bot.)
(a)
A leaflet of a pinnate leaf. See Illust. of
Bipinnate leaf
, under Bipinnate
. (b)
One of the primary divisions of a decompound leaf.
2.
(Zool.)
One of the divisions of a pinnate part or organ.
3.
[L.
pinna
, akin to Gr. [GREEK].] (Zool.)
Any species of
Pinna
, a genus of large bivalve mollusks found in all warm seas. The byssus consists of a large number of long, silky fibers, which have been used in manufacturing woven fabrics, as a curiosity.