retinaculum

noun

(L. retinaculum: any type of bond) (pl. retinacula) A band or band-like structure that holds an organ in place; a hook-like structure to which another structure is tethered; in Orchidaceae and Asclepiadaceae, the structure (sticky gland) to which pollen masses (the pollinia) are attached; in Acanthaceae, the persistent stalk of an ovule, i.e. the hook-like funicle of a seed.