Below are possible answers for the crossword clue So-called "royal herb".
5 letter answer(s) to so-called "royal herb"
BASIL
(Roman Catholic Church) the bishop of Caesarea who defended the Roman Catholic Church against the heresies of the 4th century; a saint and Doctor of the Church (329-379)
any of several Old World tropical aromatic annual or perennial herbs of the genus Ocimum
leaves of the common basil; used fresh or dried
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