Webster's Revised Unabridged Dictionary · 1913

Mohurrum

Mohurrum , noun

[Arabic muharram, prop., sacred, forbidden, n., the first month of the Mohammedan lunar year.]

1.
The first month of the Mohammedan year. — Whitworth
2.
A festival of the Shiah sect of the Muslims held during the first ten days of the month Mohurrum.

Also: Muharram