Plural of mouse, referring to small rodents or computer pointing devices.
From Old English mȳs, plural of mūs. This represents one of English's surviving examples of ancient Germanic plural formation through vowel change (ablaut) rather than adding suffixes.
The mouse-mice plural is a linguistic time capsule, preserving a 2,000-year-old Germanic grammar rule that once applied to many more words but has been almost entirely replaced by the simpler '-s' ending.
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