• Webster's Revised Unabridged Dictionary
    • n Interclavicle (Anat) See Episternum.
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Century Dictionary and Cyclopedia
    • n interclavicle In zoology and anatomy, a median membrane bone developed between the clavicles, or in front of the breast-bone, in many Vertebrata. Different names have been given to a bone answering to this definition. In the monotremes, where alone in Mammalia a true interclavicle occurs, it is the large T-shaped bone which prolongs the sternum anteriorly, bearing upon its arms the small splint-like clavicles. In a bird, when developed, it is always incorporated with the clavicles, as the hypoclidium. (See cut under furcula.) In a reptile, when developed, it is distinct from the clavicles, and in a turtle it is the entoplastron or entosternum, the median anterior piece of the plastron. (See second cut under Chelonia.) In a frog it appears to be represented by the omosternum. (See cut under omosternum.) Certain presternal elements in placental mammals are sometimes called interclavicles. In some fishes the interclavicle is an intermediate element of the scapular arch, and, like the supraclavicle and postclavicle, is variously homologized by different writers. See postclavicle, and quotation under supraclavicle.
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In literature:

The posterior end of the interclavicle lies in contact with the right scapulocoracoid.
"A New Order of Fishlike Amphibia From the Pennsylvanian of Kansas" by Theodore H. Eaton
The interclavicle is absent from all mammals except Echidna and Ornithorhynchus.
"Dragons of the Air" by H. G. Seeley
The relations of this bone to the clavicles seem to leave no doubt that it is the equivalent of the Lacertilian interclavicle or episternum.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard