• Webster's Revised Unabridged Dictionary
    • Retinaculum (Anat) A connecting band; a frænum; as, the retinacula of the ileocæcal and ileocolic valves.
    • Retinaculum (Bot) 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.
    • Retinaculum (Anat) One of the annular ligaments which hold the tendons close to the bones at the larger joints, as at the wrist and ankle.
    • Retinaculum (Zoöl) One of the retractor muscles of the proboscis of certain worms.
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Century Dictionary and Cyclopedia
    • n retinaculum In botany: A viscid gland belonging to the stigma of orchids and asclepiads. and holding the pollen-masses fast.
    • n retinaculum The persistent and indurated hook-like funiculus of the seeds in most Acanthaceæ. A. Gray.
    • n retinaculum 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.
    • n retinaculum In entomology, specifically, a small scale or plate which in some insects checks undue protrusion of the sting.
    • n retinaculum In surgery, an instrument formerly used in operations for hernia, etc.
    • n retinaculum In entomology: An arrangement of hooks, or of hooks and bristles, whereby the fore and hind wings of insects are interlocked when in flight.
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Chambers's Twentieth Century Dictionary
    • n Retinaculum ret-i-nak′ū-lum (anat.) a connecting band: one of the annular ligaments which hold the tendons close to the bones of the larger joints: :
    • n Retinaculum ret-i-nak′ū-lum (zool.) one of the retractor muscles of the proboscis of certain worms
    • n Retinaculum ret-i-nak′ū-lum (bot.) a small viscid gland.
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Webster's Revised Unabridged Dictionary
L., a holdfast, a band. See Retain


In literature:

Retinaculum: in Lepidoptera, the loop into which the frenulum of the male is fitted; = hamus, q.v.
"Explanation of Terms Used in Entomology" by John. B. Smith

In news:

For example, constant snapping at the outer ankle subsequent to a major ankle sprain is a strong indicator or rupture of the retinaculum that binds the peroneal tendons down.