• Webster's Revised Unabridged Dictionary
    • a Interambulacral (Zoöl) Of or pertaining to the interambulacra.
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Century Dictionary and Cyclopedia
    • interambulacral In echinoderms, situated between ambulacra; interradial. See cut under Astrophyton.
    • interambulacral Of or pertaining to interambulacra.
    • n interambulacral In echinoderms, one of the plates which form the skeleton.
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In literature:

Here also the interambulacral system is wanting.
"Seaside Studies in Natural History" by Elizabeth Cabot Cary Agassiz