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n. pl. pen·nae (pĕn′ē)
A contour feather of a bird, as distinguished from a down feather or a plume.

[Latin, feather; see pet- in Indo-European roots.]

pen·na′ceous (pĕ-nā′shəs) adj.
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References in periodicals archive ?
Caihong had fuzzy feathers and pennaceous ones, those that look like writing quills.
The sample was composed of a nearly equal mix of downy and pennaceous feather types.
Apart from paleontologists and creationists, nobody much cares whether those fossils that keep turning up in China really belonged to a dinosaur with pennaceous feathers.