\Cas"si*do*ny\, n. [Cf. LL. cassidonium, F.
Cassidoine. See {Chalcedony}.] (Bot.)
(a) The French lavender ({Lavandula St[oe]chas}).
(b) The goldilocks {(Chrysocoma Linosyris)} and perhaps other
    plants related to the genus {Gnaphalium} or cudweed.