From ZooTerms (Dictionary of Invertebrate Zoology)
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internode (noun; Latin inter, between; nodus, swelling): 1. The interval or part between two nodes or joints.

2. (Bryozoa) That segment of a jointed colony between surfaces of articulation.

3. (Cnidaria: Hydrozoa) A small repeated section of the stem or hydrocladium separated by a constriction of the perisarc.