bipennate
adjective
bi·pen·nate
| \ (ˈ)bī-ˈpen-ˌāt
\
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Medical Definition of bipennate
: having the fibers arranged obliquely and inserting on both sides into a central tendon
The biceps brachii is a bipennate muscle with two heads of origin.— Clifford G. Rios et al., Biomechanics, June 2003