(idiomatic, in similes) To attempt to control the uncontrollable. / Used other than figuratively or idiomatically: see herd, cat.

(physics) A superposition of the most extreme states possible in a system, analogous with Schrödinger's cat, which is in a superposition of "dead" and "alive".

Small hinged panel, usually cut into a door, with an opening just big enough for a cat to enter.

A North American carnivorous mammal (Martes pennanti) of the weasel family.

A small wild cat, Felis margarita, distributed over African and Asian deserts.

Alternative form of tomcat

a domestic cat whose fur has black, brown and yellow markings

(zoology) A domesticated cat, of the species Felis catus or Felis silvestris catus, especially one kept as a pet or for vermin control.

(medicine) Computed axial tomography scan.

A type of food specially formulated for the feeding of cats, typically composed of processed grain and meat byproducts as dry food or canned fish or meat as wet food.