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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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"Caudipteryx represents an early and preliminary step down an intriguing evolutionary pathway, and is also among the most primitive dinosaurs to possess feathers of the pennaceous (blade-like) type seen in modern birds."
Caihong had fuzzy feathers and pennaceous ones, those that look like writing quills.
The scientists described the feather as "pennaceous," meaning it was the kind of feather you might imagine when picturing a quill, with a hollow base stuck in the skin.
The sample was composed of a nearly equal mix of downy and pennaceous feather types.