| 释义 |
perradial, a. Zool.|pəˈreɪdɪəl|
[f. perradi-us + -al1; cf. radial.]
Pertaining to the perradii or primary rays of a hydrozoan or other cœlenterate; primarily radial.
1880E. R. Lankester in Nature 4 Mar. 414/1 An organ..may be..per-radial, inter-radial, or adradial in position. 1881― in Encycl. Brit. XII. 558/2 The eight arms of the disc and their tentaculocysts are [four] perradial and [four] interradial. 1888Rolleston & Jackson Anim. Life 717 (Ctenophora) The funnel gives origin to two ‘perradial’ vessels. Ibid. 781 (Hydrozoa Acraspeda) Four of them, the perradial tentacles,..correspond to the four angles of the mouth; four others, the interradial tentacles, second in development, to the centres of the square sides of the mouth, and the remaining eight adradial tentacles occupy the intervals between the per- and interradial. |