What is the X in X-mas?

12

15

Scrabble
Words With Friends

- decidua vera
- decidual cell
- deciduate
- deciduation
- deciduitis
- deciduoma
- deciduoma malignum
- deciduous
- deciduous dentition
- deciduous forest
- deciduous membrane
- deciduous tooth
- deciduous trees and shrubs
- decigram
- decile
- deciliter
- decilitre
- decillion
- decimal
- decimal classification
- decimal currency
- decimal fraction
- decimal notation
- decimal number system
- decimal place
- decimal point
- decimal system
- decimalize
- decimals
- decimate
- decimation
- decimeter
- decimetre
- decimus
- decinormal
- decipher
- decision
- decision problem
- decision procedure
- decision support
- decision support database
- decision support system
- decision support systems
- decision table
- decision theory
- decision tree
- decision, valley of
- decisive
- decius
- deck
- deck beam