请输入您要查询的英文单词:

 

单词 polyvoltine
释义

polyvoltineadj.n.

Brit. /ˌpɒlɪˈvɒltʌɪn/, U.S. /ˌpɑliˈvɑlˌtaɪn/, /ˌpɑliˈvɔlˌtaɪn/
Forms: 1800s– polyvoltin, 1800s– polyvoltine.
Origin: A borrowing from French. Etymon: French polyvoltin.
Etymology: < French polyvoltin (1869 in Littré) < poly- poly- comb. form + Italian volta turn, time (see volta n.) + French -in -ine suffix1. Compare univoltine n., bivoltine adj., etc.
Entomology.
A. adj.
Of an insect (originally a variety of the silk moth, Bombyx mori): producing several broods in a year; multivoltine.
ΚΠ
1876 L. P. Brockett Silk Industry in Amer. vi. 38 Every house should have its cocooneries attached, its silkworms of the bivoltine, trivoltine, or polyvoltine breeds yielding two, three or four crops of cocoons per year.
1948 Philos. Trans. (Royal Soc.) B. 233 412 Transplants of immature ovaries from [silkworm] larvae of bivoltine and polyvoltine races to individuals of another race resulted in the production of eggs showing the voltinism of the new mother.
1990 Jrnl. Trop. Ecol. 6 116 The species is univoltine in inundation forests, with a defined reproductive period, and is polyvoltine in dryland forests, i.e. breeds throughout the year.
B. n. rare.
A silk moth of a variety that produces several broods in a year.
ΘΚΠ
the world > animals > invertebrates > phylum Arthropoda > class Insecta > Heterocera > [noun] > family Bombycidae > genus Bombyx > silk moth > caterpillar of bombyx mori or silkworm > characterized by number of broods
bivoltine1872
univoltine1872
quadrivoltine1888
trivoltin1888
polyvoltine1890
1890 Pop. Sci. Monthly Feb. 500 For the protection of the mulberry-trees, the raising of polyvoltines, or worms that hatch several broods a year, is forbidden in many countries.
1908 L. O. Howard in L. H. Bailey Cycl. Amer. Agric. III. 640/2 In Japan,..three crops of worms may be fed annually. This, however, is not done by the use of the varieties having several generations (bivoltins, trivoltins or polyvoltins), but by..the cold storage of the eggs.
This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).
<
adj.n.1876
随便看

 

英语词典包含1132095条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。

 

Copyright © 2004-2022 Newdu.com All Rights Reserved
更新时间:2025/2/3 12:26:23