The Collaborative International Dictionary
Penniform
Penniform \Pen"ni*form\, a. [L. penna feather + -form: cf. F. penniforme.] Having the form of a feather or plume.
Wiktionary
penniform
a. feather-shaped
Usage examples of "penniform".
On examination the detached portion was found to include the terminal phalanx of the thumb, together with the tendon of the flexor longus pollicis measuring ten inches, about half of which length had a fringe of muscular tissue hanging from the free borders, indicating the extent and the penniform arrangement of the fibers attached to it.