| 释义 |
trocho-|trɒkəʊ|
before a vowel troch- |trɒk|, combining form repr. Gr. τροχός wheel, disk; occurring in several scientific words. trocheidoscope |-ˈkaɪdəskəʊp| [after kaleidoscope n.], a rotating disc with coloured sectors, for showing combinations of colours (Cassell's Encycl. Dict. 1888). trochelminth |ˈtrɒkɛlmɪnθ| [Gr. ἕλµινς, ἑλµινθ- worm], a rotifer. ˈtrochoblast [Gr. βλαστός germ], one of the embryonic cells giving rise to the prototroch in the trochophore larva of marine annelids. ˌtrochoceˈphalic |-sɪˈfælɪk| a. [Gr. κεϕαλή head], having a round form of skull due to permature union of the parietal and frontal bones; so trochocephaly |-ˈsɛfəlɪ|, the condition of being trochocephalic. trochoceracone |-ˈsɛrəkəʊn| [Gr. κέρας horn, κῶνος cone], a nautiloid shell with loose flattened coils, as those of the fossil genus Trochoceras; so trochoceran |trəʊˈkɒsərən| a., having the form or character of such a shell (Cent. Dict. Suppl.). ˌtrochocœlomate |-sɪˈləʊmət| a., belonging to the Trochocœlomata, a proposed division of Metazoa, containing animals having radiated cœlomes (= radiata). troˈchometer [-meter] = trechometer (Worcester 1846). ˈtrochophore |-fɔə(r)| [Gr. -ϕόρος bearing], ˈtrochosphere |-sfɪə(r)|, a larval form constituting a stage in the development of most molluscs and of certain worms, esp. marine annelids, characterized by a spheroidal body with a ring of cilia; also attrib.; hence trochospheric |-ˈsfɛrɪk|, -ˈspherical adjs., pertaining to or having the form of a trochosphere. trochozoon |-ˈzəʊɒn| [Gr. ζῷον animal], one of the Trochozoa, a collective name for those molluscs, annelids, etc. which pass through a trochosphere larval stage, or for such larvæ; also for a hypothetical ancestral group of animals from which these are assumed to be derived.
1904Amer. Nat. July–Aug. 500 Cells..identical in origin with the ‘primary *trochoblasts’ of the annelids.
1878Bartley tr. Topinard's Anthrop. v. 176 *Trochocephalic, very round skull.
Ibid. Index 547/1 *Trochocephaly.
1884Hyatt in Proc. Boston Soc. Nat. Hist. 5 Mar. 113 We can readily transform a protocoelomate into a *trochocoelomate by destroying the horizontal parts of the partitions between the ampullae.
1892J. A. Thomson Outlines Zool. xi. 182 By far the most important larval form among Annelids is that known as the Trochosphere or *Trochophore. 1909J. W. Jenkinson Experim. Embryol. 213 Eight instead of the usual four macromeres were found in the Trochophore larva.
1883E. R. Lankester in Encycl. Brit. XVI. 648/1 [In the Limpet the] Diblastula..acquires a ciliated band, and becomes a nearly spherical *Trochosphere. 1888Rolleston & Jackson Anim. Life 454 The Mollusca with the exception of Cephalopoda pass through a typical larval development, in two stages—a Trochosphere and a Veliger stage.
1899Syd. Soc. Lex., *Trochospheric.
1891Cent. Dict., *Trochospherical.
1890Nature 22 May 94/1 The author's conclusions are, that the Balanoglossus..has originated from a *trochozoon which acquired some features in common with worms. |