home Michael Tolmachev hair [hair] –noun 1. any of the numerous fine, usually cylindrical, keratinous filaments growing from the skin of humans and animals; a pilus. 2. an aggregate of such filaments, as that covering the human head or forming the coat of most mammals. 3. a similar fine, filamentous outgrowth from the body of insects, spiders, etc. 4. Botany. a filamentous outgrowth of the epidermis. 5. cloth made of hair from animals, as camel and alpaca. h a b c d e f g h i j k l m n o p q r s t u v w x y z hair hand half heart hang hang-time heaven herculean helicopter hickey hide-and-seek hig-hz hair-dryer