Definition of romerillo
1 : any of several tropical American plants with an aromatic odor most of which yield native remedies or dyes: such as a : a South American herb (Heterothalamus brunioides) of the family Compositae whose flower heads yield a yellow dye b : a Mexican shrubby milkweed (Asclepias linaria) that yields a violent purge c : any of several Mexican plants of the family Compositae (especially Porophyllum scoparium and Chrysactinia mexicana)
2 : the dye yielded by the South American herb romerillo
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