- Mother-of-pearl glass
noun 1. . noun 1. an American art glassware having colored glass set into indentations in a thickness of opaque glass, the whole covered with clear glass and etched slightly with acid.
- Mother-of-pearl moth
noun 1. a pyralid moth, Pleuroptya ruralis, having a pale sheen, that is often seen around nettles, on which its green larvae feed
- Mother of satan
noun 1. an informal name for TATP
- Mother of the chapel
noun 1. (in British trade unions in the publishing and printing industries) a woman shop steward MoC