condyle
From ZooTerms (Dictionary of Invertebrate Zoology)
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2. (Arthropoda) The surfaces between arthropod joints, that provide the fulcra on which the joints move.
3. (Bryozoa: Gymnolaemata) In some cheilostomates, one of a pair of bilateral skeletal protruberances on which the operculum of an autozooid or mandible of an avicularium is hinged; in asymmetrical avicularia can be single.
4. (Mollusca: Bivalvia) An enlarged prominent end of a shell.