radiole

名词 n.
中文释义
英 /ˈɹeɪdɪəʊl/    美 /ˈɹeɪdɪəʊl/

英文释义

名词 n.
  1. The spine of a sea urchin.
    — Radioles or spines [...] are the appendages articulating upon the tubercles. The different parts of the spines are the socket by which it is articulated to the tubercles; the lower part of the radiole is called the head, and is separated from the neck, which is usually smooth or finely striated, by the milled ring,—a prominent ridge more or less deeply grooved, serving as an attachment for the muscles which are to move the spine; beyond the neck we have the body or shaft of the spine.
  2. A heavily ciliated feather-like tentacle occurring in clusters on the crowns of certain tubeworms, especially those of the order Canalipalpata (fan-head worms), used for feeding and respiration.
    — Fabricia bikinii, n. sp. [...] The tentacular crown is composed of three pairs of symmetrical radioles; in addition there are shorter, entire, paired filamentous processes, or palpi, at the ventral end of the crown [...]. Each radiole has 6 to 8 pairs of slender filaments that arise along the basal half of the radiole; these filaments extend distally not quite as far as the radioles to which they are attached.

词形变化

radioles plural

词源

From Late Latin radiolus (“a fossil echinoid’s spine”), from Latin radius (“rod, staff”) (possibly ultimately from Proto-Indo-European *reh₁t- (“beam, pole, post”)) + -olus (diminutive suffix) (ultimately from Proto-Indo-European *-lós). The word first appears in the works of Scottish natural historian and marine zoologist Charles Wyville Thomson (1830–1882).
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