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Webster 1913 Edition

Adj.

[L.

penna

feather +

-form

: cf. F.

penniforme

Having the form of a feather or plume.

Adj.

[L.penna, a feather or quill, and form.]

Having the form of a quill or feather.

penniform ‎(comparative more penniform, superlative most penniform)