请输入您要查询的英文单词:

 

单词 bract
释义

Definition of bract in English:

bract

noun braktbrækt
Botany
  • A modified leaf or scale, typically small, with a flower or flower cluster in its axil. Bracts are sometimes larger and more brightly coloured than the true flower, as in poinsettia.

    Example sentencesExamples
    • Even though a continuum was observed between the ‘true’ leaves and bracts, for simplicity all primordia bearing an axillary flower were considered as a bract.
    • Grasses and bamboos are known to have large deposits of silica in the tissues of leaf blades and inflorescence bracts.
    • What we think are flowers are actually brightly hued leaf bracts.
    • Flowers are generally borne solitarily in leaf axils or in inflorescences subtended by bracts, but some taxa are ebractate.
    • In addition to a terminal flower there may be several smaller lateral flowers in the axil of cupular bracts, each surrounded by its own small cupule.
    Synonyms
    frond

Derivatives

  • bracteal

  • adjective
    Botany

Origin

Late 18th century: from Latin bractea 'thin plate of metal'.

Rhymes

abreact, abstract, act, attract, compact, contract, counteract, diffract, enact, exact, extract, fact, humpbacked, impact, interact, matter-of-fact, pact, protract, redact, refract, retroact, subcontract, subtract, tact, tract, transact, unbacked, underact, untracked
 
 

Definition of bract in US English:

bract

nounbraktbrækt
Botany
  • A modified leaf or scale, typically small, with a flower or flower cluster in its axil. Bracts are sometimes larger and more brightly colored than the true flower, as in poinsettia.

    Example sentencesExamples
    • Grasses and bamboos are known to have large deposits of silica in the tissues of leaf blades and inflorescence bracts.
    • In addition to a terminal flower there may be several smaller lateral flowers in the axil of cupular bracts, each surrounded by its own small cupule.
    • What we think are flowers are actually brightly hued leaf bracts.
    • Flowers are generally borne solitarily in leaf axils or in inflorescences subtended by bracts, but some taxa are ebractate.
    • Even though a continuum was observed between the ‘true’ leaves and bracts, for simplicity all primordia bearing an axillary flower were considered as a bract.
    Synonyms
    frond

Origin

Late 18th century: from Latin bractea ‘thin plate of metal’.

 
 
随便看

 

英语词典包含464360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:2024/12/22 22:58:31