What is the X in X-mas?
Old English torr, from Latin turris "high structure" (cf. Old French tor, 11c.; Spanish, Italian torre "tower"), possibly from a pre-Indo-European Mediterranean language. Also borrowed separately 13c. as tour, from Old French tur. The modern spelling first recorded in 1520s. Meaning "lofty pile or mass" is recorded from mid-14c.
c.1400; see tower (n.). Related: Towered; towering.
of Babel (Gen. 11:4), Edar (Gen. 35:21), Penuel (Judg. 8:9, 17), Shechem (9:46), David (Cant. 4:4), Lebanon (7:4), Syene (Ezek. 29:10), Hananeel (Zech. 14:10), Siloam (Luke 13:4). There were several towers in Jerusalem (2 Chr. 26:9; Ps. 48:12). They were erected for various purposes, as watch-towers in vineyard (Isa. 5:2; Matt. 21:33) and towers for defence.