XENOCRYST Meaning of XENOCRYST in English [ 'zɛnə(ʊ)krɪst ]■ noun Geology a crystal in an igneous rock which is not derived from the original magma.Derivatives~ic adjective OriginC19: from xeno- + crystal . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004