a. [f. Gr. ἐπίκεντρ-ος (see EPICENTRUM, which in sense 2 is the immediate source) + -AL.]

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  1.  Situated upon a (vertebral) ‘centrum.’ Also quasi-sb. (see quot.)

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1866.  Owen, Anat., I. 43. These ‘scleral’ spines [of fishes] are termed, according to the vertebral element they may adhere to, ‘epineurals,’ ‘epicentrals,’ and ‘epipleurals.’… In Esox … the … epicentral spines are present.

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  2.  Of or pertaining to an epicentrum.

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1887.  Science (U. S. A.), 20 May, 495/1. The determination of the epicentral tract.

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