Definition of plumicorn in US English:

plumicorn

noun

Ornithology
rare
  • A tuft or crest of feathers on top of a bird's head; especially either of the paired ear tufts typical of many owls.

Origin

Late 19th century; earliest use found in Science. From classical Latin plūmi-, combining form (in e.g. plūmipēs) of plūma plume + cornu horn.

Pronunciation

plumicorn

/ˈpluːmɪkɔːn/