keeper

noun

1. a person who guards or watches, as at a prison or gate.
2. a person who assumes responsibility for another’s behavior: He refused to be his brother’s keeper.
3. a person who owns or operates a business (usually used in combination): a hotelkeeper.
4. a person who is responsible for the maintenance of something (often used in combination): a zookeeper; a groundskeeper.
5. a person charged with responsibility for the preservation and conservation of something valuable, as a curator or game warden.
6. a person who conforms to or abides by a requirement: a keeper of his word.
7. a fish that is of sufficient size to be caught and retained without violating the law.
8. Football. a play in which the quarterback retains the ball and runs with it, usually after faking a hand-off or pass.
9. something that serves to hold in place, retain, etc., as on a door lock.
10. something that lasts well, as a fruit.
11. guard ring.
12. an iron or steel bar placed across the poles of a permanent horseshoe magnet for preserving the strength of the magnet during storage.

noun

1. a person in charge of animals, esp in a zoo
2. a person in charge of a museum, collection, or section of a museum
3. a person in charge of other people, such as a warder in a jail
4. See goalkeeper, wicketkeeper, gamekeeper
5. a person who keeps something
6. a device, such as a clip, for keeping something in place
7. a soft iron or steel bar placed across the poles of a permanent magnet to close the magnetic circuit when it is not in use