An archaic or rare term relating to Christmas or the celebration of Christ's birth in the Christian calendar.
Combination of 'christen' and 'mas' (from Latin 'missa', meaning 'mass'). This is an extremely rare variant, possibly a scribal or dialectal form from Middle English manuscripts.
This word barely survives in historical documents—it's a linguistic fossil showing how English speakers once experimented with different ways to name Christmas before 'Christmas' became standardized.
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