two-winged
• (a.) Alt. of Bipennated
Bipenniform ... Pertaining to a muscle with a central tendon toward which the fibres converge on either side like the barbs of a feather. ... Origin: bi-+ L. Penna, feather ... (05 Mar 2000) ... 
Type: Term Pronunciation: bī-pen′āt, pen′i-fōrm Definitions: 1. Pertaining to a muscle with a central tendon toward which the fibers converge on either side like the barbs of a feather.
(bi-pen;at) Denoting muscles that have a fiber architecture coursing obliquely on both sides of a tendon.
bipennate, bipenniform 1. Having the appearance of a feather with barbs on both sides of the shaft; such as certain muscles. 2. Oblique fibers that converge on both sides of a central tendon.
adjective, Latin bis = double, and pinna = feather, hence converging from 2 sides.