pen·​nate ˈpe-ˌnāt How to pronounce pennate (audio)
: of, relating to, or being usually elongate bilaterally symmetrical diatoms of an order (Pennales) having a raphe or a similar structure

Word History


irregular from New Latin Pennales

First Known Use

1938, in the meaning defined above

Time Traveler
The first known use of pennate was in 1938

Dictionary Entries Near pennate

Cite this Entry

“Pennate.” Dictionary, Merriam-Webster, Accessed 17 Jun. 2024.

Medical Definition


pen·​nate ˈpen-ˌāt How to pronounce pennate (audio)
: having a structure like that of a feather
especially : being a muscle in which fibers extend obliquely from either side of a central tendon
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