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(Biology) situated between two radii or rays, esp between the radii of a sea urchin or similar animal
ˌinterˈradially adv
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌɪn tərˈreɪ di əl)

situated between radii or rays.
in`ter•ra′di•al•ly, adv.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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2C', is cylindrical 4A-F with two raised bands of ectoderm; buccal podia can be seen in the oral field; epineural folds have grown interradially toward the mouth to separate the developing arms; tracts of cilia are thinner and more connected to form bands; cilia are associated with the hydropore; larval neurons and neurons in the axial region are still present; juvenile nerves and muscles begin to form; muscles staining occurs in the water vascular system; muscle fibers extend dorsally from the base of the tube feet into the body disk Juvenile Juvenile has 19 days Fig.
The odontophore is small and round, and located interradially between mouth angle ossicles on the oral surface (Fig.