kittens is a form of:

Outfield



ENGLISH MEANING
noun
1.
Arable land which has been or is being exhausted.
2.
A field beyond, or separated from, the inclosed land about the homestead; an uninclosed or unexplored tract. Also used figuratively.
3.
The part of the field beyond the diamond, or infield. It is occupied by the fielders.
4.
The part of the field farthest from the batsman.