(surgery) A diagnostic biopsy used to investigate lumps

(humorous) A hammer.

Alternative form of fine-structure constant

Alternative form of fine-tooth comb

(simile) Alternative form of fine as frog hair (“very fine; great; splendid”).

plural of fine-needle aspiration

(dated) To comb or go through (hair, an animal's fur, etc.) with a comb having fine, closely spaced teeth. / (figuratively) To search (something or somewhere) meticulously.

A comb with fine, closely spaced teeth, especially one used for removing head lice and their nits (eggs) from the hair; a nit comb. / (figuratively) A means of making a thorough search.

(electrodynamics) The fundamental physical value α, presumed to be constant, that characterizes the strength of the electromagnetic force.

(idiomatic) To a point of exceptional proficiency.