Webster's Revised Unabridged Dictionary · 1913

Liliaceous

Liliaceous (lil`i*ā"shus) , adjective

[Latin liliaceus, from lilium lily. See Lily.]

(a)
(Botany) Of or pertaining to a natural order of which the lily, tulip, and hyacinth are well-known examples.
(b)
(Botany) Like the blossom of a lily in general form.