retinaculum

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A band or bandlike structure that holds an organ or a part in place.

from The Century Dictionary.

• noun In entomology: An arrangement of hooks, or of hooks and bristles, whereby the fore and hind wings of insects are interlocked when in flight.
• noun In botany: A viscid gland belonging to the stigma of orchids and asclepiads. and holding the pollen-masses fast.
• noun The persistent and indurated hook-like funiculus of the seeds in most Acanthaceæ. A. Gray.
• noun In anatomy, a restraining band; a bridle or frenum: applied to such fibrous structures as those which bind down the tendons of muscles; also to the bridle of the ileocæcal valve.
• noun In entomology, specifically, a small scale or plate which in some insects checks undue protrusion of the sting.
• noun In surgery, an instrument formerly used in operations for hernia, etc.

from the GNU version of the Collaborative International Dictionary of English.

• noun A connecting band; a frænum.
• noun One of the annular ligaments which hold the tendons close to the bones at the larger joints, as at the wrist and ankle.
• noun (Zoöl) One of the retractor muscles of the proboscis of certain worms.
• noun (Bot.) A small gland or process to which bodies are attached.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun anatomy A connecting band.
• noun anatomy One of the annular ligaments which hold the tendons close to the bones at the larger joints, as at the wrist and ankle.
• noun zoology One of the retractor muscles of the proboscis of certain worms.
• noun zoology A loop on the underside of the forewing of some moths.
• noun botany A small gland or process to which bodies are attached; as, the glandular retinacula to which the pollinia of orchids are attached, or the hooks which support the seeds in many acanthaceous plants.