immure (v.) Look up immure at Dictionary.com
1580s, "enclose with walls, shut up, confine," from Middle French emmurer and directly from Medieval Latin immurare, literally "to shut up within walls," from assimilated form of in- "into, in" (from PIE root *en "in") + Latin murus "wall" (see mural). Military sense of "fortify" is from 1590s. Related: Immured; immuring; immurement.