The Collaborative International Dictionary of English v.0.48:
Gillyflower \Gil"ly*flow`er\, n. [OE. gilofre, gilofer, clove,
OF. girofre, girofle, F. girofle: cf. F. girofl['e]e
gillyflower, fr. girofle, Gr. ? clove tree; ? nut + ? leaf,
akin to E. foliage. Cf. Caryophyllus, July-flower.]
[Written also gilliflower.] (Bot.)
1. A name given by old writers to the clove pink (Dianthus
Caryophyllus) but now to the common stock (Matthiola
incana), a cruciferous plant with showy and fragrant
blossoms, usually purplish, but often pink or white.
2. A kind of apple, of a roundish conical shape, purplish red
color, and having a large core.
Clove gillyflower, the clove pink.
Marsh gillyflower, the ragged robin (Lychnis
Queen's gillyflower, or Winter gillyflower, damewort.
Sea gillyflower, the thrift (Armeria vulgaris).
Wall gillyflower, the wallflower (Cheiranthus Cheiri).
Water gillyflower, the water violet.