Definition of penniform in US English:

penniform

adjective

Anatomy Biology
  • Resembling a feather; specifically (of a muscle) having fibres attached to a tendon like the barbs of a feather to the rachis.

Origin

Early 18th century. From post-classical Latin penniformis (G. A. Borelli De Motu Animalium I. xv. 123) from penna feather + -formis.

Pronunciation

penniform

/ˈpɛnɪfɔːm/