Origin: OE. Titemose, titmase; tit small, or a small bird _ AS. Mase a kind of small bird; akin to D. Mees a titmouse, G. Meise, OHG. Meisa, Icel. Meisingr. The English form has been influenced by the unrelated word mouse. Cf. Tit a small bird.
The blue titmouse (Parus coeruleus), the marsh titmouse (P. Palustris), the crested titmouse (P. Cristatus), the great titmouse (P. Major), and the long tailed titmouse (aegithalos caudatus), are the best-known European species. See Chickadee.