- hair, pilus - any of the cylindrical filaments characteristically growing from the epidermis of a mammal; "there is a hair in my soup"
--1 is a kind of filament, filum
--1 is a part of mammal
--1 has particulars: ingrown hair - pilus - hairlike structure especially on the surface of a cell or microorganism
--2 is a kind of hair
--2 is a part of microorganism