embrasure

n [C] (a) opening for a door or window, wider on the inside than the outside, in an interior wall, esp of an old castle 斜面墙（内宽外窄的门窗的开口）（尤指古城堡的）. (b) similar opening in a castle, fort, etc for shooting through （城堡、 要塞等的）炮眼, 枪眼, 射击孔.

embed, embedded, embellish, embellishment, ember, embezzle, embezzlement, embezzler, embitter, embitterment, emblazon, emblazonment, emblem, emblematic, embodiment, embody, embolden, embolism, emboss, embrace, embrocation, embroider, embroidery, embroil, embryo, embryology, embryonic, emcee, emend, emendation, emerald, emerge, emergence, emergency, emergency-room, emergent, emeritus, emery, emery-board, emery-paper,