perradiusn.

Brit.

/pəˈreɪdɪəs/, U.S.

/pəˈreɪdiəs/

Inflections: Plural perradii.

Origin: Formed within English, by derivation. Etymons: per- prefix, radius n.

Etymology: < per- prefix + radius n. Compare perradial adj. and later perradial n.

Zoology.

Each of the primary rays or axes in certain coelenterates and ctenophores.

ΘΚΠ

the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [noun] > member of > parts of > radiating part

radius1698

perradius1880

1880 E. R. Lankester in Nature 4 Mar. 414/1 The first four radii [of a discomedusan hydrozoan] to appear..are called the per-radii, the next four (between these) the inter-radii, the next eight between these the adradii.

1961 J. Stubblefield Davies's Introd. Palaeontol. (ed. 3) viii. 187 The five radii which can be drawn from the centre of the calyx through the middle of each radial plate are called perradii.

1995 Philos. Trans. (Royal Soc.) B. 347 227/2 Diadematoid-arbaciid style, with upper and lower elements reduced and typically occluded from the perradius.

This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022).

单词	perradius
释义	perradiusn. Brit. /pəˈreɪdɪəs/, U.S. /pəˈreɪdiəs/ Inflections: Plural perradii. Origin: Formed within English, by derivation. Etymons: per- prefix, radius n. Etymology: < per- prefix + radius n. Compare perradial adj. and later perradial n. Zoology. Each of the primary rays or axes in certain coelenterates and ctenophores. ΘΚΠ the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [noun] > member of > parts of > radiating part radius1698 perradius1880 1880 E. R. Lankester in Nature 4 Mar. 414/1 The first four radii [of a discomedusan hydrozoan] to appear..are called the per-radii, the next four (between these) the inter-radii, the next eight between these the adradii. 1961 J. Stubblefield Davies's Introd. Palaeontol. (ed. 3) viii. 187 The five radii which can be drawn from the centre of the calyx through the middle of each radial plate are called perradii. 1995 Philos. Trans. (Royal Soc.) B. 347 227/2 Diadematoid-arbaciid style, with upper and lower elements reduced and typically occluded from the perradius. This entry has been updated (OED Third Edition, December 2005; most recently modified version published online March 2022). < n.1880
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