Biter definition: a person or animal that bites, esp. habitually or viciously | Meaning, pronunciation, translations and examples in American English. The meaning of BITTER is being, inducing, or marked by the one of the five basic taste sensations that is peculiarly acrid, astringent, and often disagreeable and characteristic of citrus peels, unsweetened cocoa, black coffee, mature leafy greens (such as kale or mustard), or ale.