From ZooTerms (Dictionary of Invertebrate Zoology)
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trabecula (noun; plural -lae; Latin trabecula, little beam): 1. A small bar, rod, bundle of fibers, or septum together with other trabeculae which form part of the framework of various organs

See also: internuncial process. 2. (Mollusca: Cephalopoda) In squid and cuttlefish, a support from the edge of the arm inward for the protection of membranes of the arm.