Definitions

1. adjective

Having or resembling a feather, especially a feather that has a quill at the base.

“The pennaceous plumes of the bird stood out against the sky.”

2. noun

A feather or feathers, especially when arranged in a crest or other display.

“The bird’s pennaceous crest was an impressive sight.”

3. noun

A quill or a feather with a quill at the base, used for writing.

“The artist used a pennaceous to create intricate designs.”