Having the form or shape of two feathers; resembling a double-feathered structure in shape or arrangement.
From bi- (two) + penniform (feather-shaped, from Latin penna + forma). The -form suffix emphasizes the shape or morphological form.
Muscle fibers can be bipenniform—they're arranged like a feather on both sides of a central tendon, which gives them more power than straight fibers!
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