n.1 (in full clove gillyflower) a clove-scented pink (see CLOVE(1) 2).
2 any of various similarly scented flowers such as the wallflower or white stock.
Etymology: ME gilofre, gerofle f. OF gilofre, girofle, f. med.L f. Gk karuophullon clove-tree f. karuon nut + phullon leaf, assim. to FLOWER