noun, plural pili [pahy-lahy] . Biology.
a hair or hairlike structure.

1955–60; < Latin

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pilus pi·lus (pī'ləs)
n. pl. pi·li (-lī')

  1. A hair.

  2. A fine filamentous appendage, somewhat analogous to the flagellum, that occurs on some bacteria. Also called fimbria.

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