Origin of titmousealtered, influenced, influence by mouse ; from Middle English titemose, probably ; from tit-, little + Old English mase, titmouse, akin to German meise
Origin of titmouseAlteration (influenced by mous, mouse) of Middle English titmose : tit- (probably from Old Norse tittr, small peak, pin, titmouse) + mose, titmouse (from Old English mase).
(plural titmouses or titmice)
From Middle English titmose, compound of tit (“small bird") and Old English mÄse (“titmouse"), from Proto-Germanic *maisÇ (compare Dutch mees, German Meise, Old Norse meisingr), from *maisaz (“tiny, puny") (compare Norwegian meis (“skinny weakling")). The plural is formed in imitation of the otherwise unrelated mouse.