Kittened is a word that describes the process of a female cat giving birth to a litter of kittens. There are several synonyms for this word, such as "whelped" and "kindled". "Whelped" is a term that is often used to describe the birth of puppies or other small mammals, while "kindled" is a more poetic synonym that implies the gentle and nurturing nature of the birthing process. Other synonyms that could be used to describe this process include "brought forth" or "delivered". Regardless of the word used, the act of a female cat giving birth to a litter of kittens is a natural and beautiful occurrence.