X·mas 
(krĭsməs, ĕksməs)
(krĭsməs, ĕksməs)n.
Christmas.
[From X, the Greek letter chi, first letter of Greek Khrīstos, Christ; see CHRIST.]
Usage Note: The pronunciation (ĕksməs) is the result of a misinterpretation of the abbreviation Xmas, where the X actually represents a Greek chi, the first letter of Khrīstos, "Christ." This pronunciation is informal.
- bygone
- by half
- by halves
- by hand
- by heart
- by hook or by crook
- by/in virtue of
- by Jove
- bylaw
- by leaps and bounds
- byline
- by-line
- byliner
- by means of
- by-name
- by no means
- BYOB
- by one's bootstraps
- by oneself
- by (one's) (own) bootstraps
- by one's own bootstraps
- by (or in)fits and starts
- by (or in) fits and starts
- by own bootstraps
- bypass