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Available Definitions:
1)  n. - A connecting band; a fraenum; as, the retinacula of the ileocaecal and ileocolic valves.
2)  n. - One of the annular ligaments which hold the tendons close to the bones at the larger joints, as at the wrist and ankle.
3)  n. - One of the retractor muscles of the proboscis of certain worms.
4)  n. - 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.