(1):

(n.) The name also given to Scilla Peruviana, a Mediterranean plant, one variety of which produces white, and another blue, flowers; - called also, from a mistake as to its origin, Hyacinth of Peru.

(2):

(n.) A plant of the genus Camassia (C. Farseri), called also Eastern camass; wild hyacinth.

(3):

(n.) A red variety of zircon, sometimes used as a gem. See Zircon.

(4):

(n.) A bulbous plant of the genus Hyacinthus, bearing beautiful spikes of fragrant flowers. H. orientalis is a common variety.