interradial

[in-ter-rey-dee-uhl]

adjective

1. situated between the radii or rays.

   interradial petals.

interradial

/ ˌɪntəˈreɪdɪəl /

adjective

1. situated between two radii or rays, esp between the radii of a sea urchin or similar animal

Other Word Forms

• interradially adverb

Word History and Origins

Origin of interradial¹

First recorded in 1865–70; inter- + radial

Example Sentences

Interrā′dius, an interradial part, esp. of a hydrozoan.

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Each plate of the upper circlet supports an arm, and is called a “radial”; the plates of the lower circlet, the “basals,” rest on the stem and alternate with those of the upper circlet, i.e. are interradial in position.

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Sub-class I. Monocyclica.—Crinoidea in which the base consists of BB only, the aboral prolongations of the chambered organ being interradial; new columnals are introduced at the extreme proximal end of the stem.

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Division B. Eublastoidea.—Blastoidea in which the thecal plates have assumed a definite number and position in 3 circlets, as follows: 3 basals, 2 large and 1 small; 5 radials, often fork-shaped, forming a closed circlet; 5 deltoids, interradial in position, supported on the shoulders or processes of the radials, and often surrounding the peristome with their oral ends.

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T, The five interradial tentacles.

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