What is the X in X-mas?
Old English stærlinc, with diminutive suffix -linc, from stær "starling," from Proto-Germanic *staraz (cf. Old English stearn, Old Norse stari, Norwegian stare, Old High German stara, German star "starling"), from PIE *storo- (cf. Latin sturnus "starling," Old Prussian starnite "gull").
Starling Star·ling (stär'lĭng), Sir Ernest. 1866-1927.
British physiologist. With Sir William Bayliss he discovered (1902) the hormone secretin.