comb

1. A toothed implement for grooming the hair or (formerly) for keeping it in place.
2. A machine used in separating choice cotton fibers from worsted cloth fibers.
3. The toothed plate at the top and bottom of an escalator that prevents objects getting trapped between the moving stairs and fixed landings.
4. A toothed tool used for chasing screws on work in a lathe; a chaser.
5. The notched scale of a wire micrometer.
6. The collector of an electrical machine, usually resembling a comb.
7. A toothed plate used for creating wells in agar gels for electrophoresis.
8. A toothed wooden pick used to push the weft thread tightly against the previous pass of thread to create a tight weave.

Plural combs