In zoology, relating to or resembling feathers with a hair-like filament; describing a type of feather structure.
From Late Latin filum (thread) and pluma (feather) plus the adjective suffix '-aceous' (resembling). Technical ornithological term from 19th century.
Filoplumaceous feathers, found hidden beneath visible feathers in birds, act like nature's insulation system—they trap air so effectively that penguins can survive Antarctic waters at -40°C.
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