grisial

== Welsh == === Noun === grisial m (plural grisialau) crystal === Adjective === grisial (feminine singular grisial, plural grisial, not comparable) crystalline === Mutation === === Further reading === R. J. Thomas, G. A. Bevan, P. J. Donovan, A. Hawke, et al., editors (1950–present), “grisial”, in Geiriadur Prifysgol Cymru Online (in Welsh), University of Wales Centre for Advanced Welsh & Celtic Studies