parsley (n.)

biennial garden-herb, originally from the eastern Mediterranean; its aromatic leaves are used for flavoring and as a garnish; late 14c., a merger of Old English petersilie and Old French peresil (13c., Modern French persil), both from Medieval Latin petrosilium, an unexplained alteration of Latin petroselinum, from Greek petroselinon "rock-parsley," from petros "rock, stone" (see petrous) + selinon "celery" (see celery).