Ranunculaceous \Ra*nun`cu*la"ceous\, a. [See Ranunculus.]

(Bot.) Of or pertaining to a natural order of plants (Ranunculace[ae]), of which the buttercup is the type, and which includes also the virgin's bower, the monkshood, larkspur, anemone, meadow rue, and peony.

Source: Webster's Revised Unabridged Dictionary (1913)