CRUSTOSE Meaning of CRUSTOSE in English [ 'krʌstəʊs ]■ adjective Botany (of a lichen or alga) forming or resembling a crust.OriginC19: from L. crustosus , from crusta (see crust ). Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004