A small wad of fur or mass of hair formed in the digestive system of a cat or other animal, from hair ingested while grooming. / (slang, figuratively) A messy, tangled, intractable issue.

(accounting) An accounting period of one year, not necessarily coinciding with the calendar year.

(transitive) To hone again or anew.

Having no spines, prickles, or thorns. / Having no spinal column. / Cowardly, uncourageous; lacking character.