WordReference Random House Unabridged Dictionary of American English © 2020
herb Robert, pl.  herbs Robert. 
  1. Plant Biologya wild geranium, Geranium robertianum, having fernlike, scented leaves and reddish-purple flowers. Also called  red shanks. 
  • Medieval Latin herba Robertī Robert's herb
  • Middle English 1250–1300

Collins Concise English Dictionary © HarperCollins Publishers::
herb Robert n ( pl herbs Robert)
  1. a low-growing N temperate geraniaceous plant, Geranium robertianum, with strongly scented divided leaves and small pink flowers
Etymology: 13th Century: from Medieval Latin herba Roberti herb of Robert, probably named after St Robert, 11th-century French ecclesiastic
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