Wean: The process of making a kitten eat solid food instead of its mother's milk; to accustom (the young of a mammal) to take nourishment other than by suckling.

Whisker Break: A term referring to an indentation in the upper jaw.

Whisker Pad: A term referring to the thickened or fatty pads around the whisker area.

Whole: Not neutered or spayed.

Wild Type: The typical form of an organism, strain, gene, or characteristic as it occurs in nature, as distinguished from mutant forms that may result from selective breeding. For cats, this is the shorthaired brown-striped tabby.

White Spotting: A term referring to a coat pattern of random patches of white on a colored coat which vary from small spots to large areas.