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1550s, folk etymology spelling (by association of flower) of gilofre, originally "clove," c.1300, from Old French girofle "clove," ultimately from Greek karyophyllon "clove, nut leaf, dried flower bud of clove tree," from karyon "nut" (see karyo-) + phyllon "leaf" (see folio). The flower so named for its scent, so called from late 14c.
any of several scented flowering plants, especially the carnation, or clove pink (Dianthus caryophyllus), stock (Matthiola incana), and wallflower (Cheiranthus cheiri). However, the gillyflower of Chaucer, Spenser, and Shakespeare was the carnation. Other plants that are types of gillyflower are dame's gillyflower, also known as dame's violet (Hesperis matronalis); mock gillyflower, also known as soapwort or bouncing bet (Saponaria officinalis); feathered gillyflower, also known as the grass or garden pink (Dianthus plumarius); and sea gillyflower, also known as the thrift or sea pink (Armeria maritima).