pilus

Noun
  1. is a type of: filament, filum - a threadlike structure (as a chainlike series of cells)
    subtypes: ingrown hair - a hair that does not emerge from the follicle but remains embedded in the skin (usually causing inflammation)
    is a part of: mammal, mammalian - any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk
    same as: hair
  2. is a type of: hair - a filamentous projection or process on an organism
    is a part of: micro-organism, microorganism - any organism of microscopic size

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