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单词 circumnutation
释义

circumnutation /ˌsɜːkəmnjʊ'teɪʃən//'sɝkəmnʊ'teʃən/

英汉-汉英词典
n. 回旋运动
词组 | 习惯用语
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  • circumnavigation n. 世界一周旅行;周游世界
  • argumentation n. 论证;争论;辩论
  • circumlocution n. 迂回的话语 托词,推诿的话 累赘的话;累赘的说法
  • circumvention n. 陷害,欺骗
circumnutation n. 回旋运动;屈垂
英语百科

Nutation (botany)

Nutation is the bending movements executed by some plant organs, such as stems, leaves, roots, etc., by which the part is inclined successively in various directions. Nutations are due to the unequal rate of growth of different sides of the organ, an inequality which, so far as is known at present (c. 1915), is dependent upon internal (unknown) causes and is not called forth by the action of external stimuli. The word is often used in a broad sense in the phrase nutational movement, to include all the movements in plants caused by growth in contrast to variation movements or movements produced by reversible turgor changes.

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