GIL'LYFLOWER, noun [supposed to be a corruption of July-flower.] The name of certain plants. The clove gilly-flower is of the genus Dianthus, or carnation pink; the stock gillyflower is the Cheiranthus; the queen's gillyflower is the Hesperis.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI