Plural of biter; things or creatures that bite, or people or animals that have a tendency to bite.
From bite (Old English bitan, 'to cut or seize with teeth') + -er (suffix meaning 'one who does something') + -s (plural marker). The word has been used since at least the 1500s to describe creatures known for biting.
Dogs, mosquitoes, and even some fish are all called 'biters,' but the word also applies to things with metaphorical teeth—like bitter cold that 'bites' at your skin, showing how we extend animal words to describe sensations.
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