Webster's Revised Unabridged Dictionary · 1913

Monastic

Monastic , noun

A monk.

Monastic , adjective

[Greek {not transcribed} monk: compare French monastique. See Monastery.]

1.
Of or pertaining to monasteries, or to their occupants, rules, etc., as, monastic institutions or rules.
2.
Secluded from temporal concerns and devoted to religion; recluse.
A life monastic. — Denham

Also: Monastical