Definition of jacinth:

part of speech: noun

An other name for the hyacinth, a species of precious stone.

Usage examples:

• The oriental jacinth or hyacinth, is a brown- red corundum, which is more stable than the ordinary hyacinth, this latter being a form of zircon; it changes colour on exposure to light, which colour is not restored by subsequent retention in darkness. John Mastin in "The Chemistry, Properties and Tests of Precious Stones".

• The Princess Clotilda took, as if in a dream, the ring of transparent jacinth set in solid gold, and asked quietly: " What would the king of the Franks with me?" E. S. Brooks in "Historic Girls".