mu·ci·lag·i·nous \|myüsə|lajənəs\adjective Etymology: Late Latin mucilaginosus, from mucilagin-, mucilago mucilage + Latin -osus -ose 1. a.: relating to mucilage or the secretion of mucilage < mucilaginous disorganization in a plant cell > b.: resembling mucilage: as (1): viscid and moist (2): slimily sticky 2.: containing or secreting mucilage < a mucilaginous plant cell > • mu·ci·lag·i·nous·lyadverb