What is the X in X-mas?
small brownish-gray bird, Old English spearwa, from Proto-Germanic *sparwan (cf. Old Norse spörr, Old High German sparo, German Sperling, Gothic sparwa), from PIE *sper- (cf. Cornish frau "crow;" Old Prussian spurglis "sparrow;" Greek spergoulos "small field bird," psar "starling"). Sparrowhawk is attested from c.1400. Sparrowfarts (1886) was Cheshire slang for "very early morning."
Mentioned among the offerings made by the very poor. Two sparrows were sold for a farthing (Matt. 10:29), and five for two farthings (Luke 12:6). The Hebrew word thus rendered is _tsippor_, which properly denotes the whole family of small birds which feed on grain (Lev. 14:4; Ps. 84:3; 102:7). The Greek word of the New Testament is _strouthion_ (Matt. 10:29-31), which is thus correctly rendered.