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单词 bract
释义
bract
noun[C]
biologyspecialized
uk
/brækt/us
/brækt/
atypeofleafthatgrowsfrom theareajust below aflowerand is sometimes different inshapeorcolourfrom themainleaves:
苞叶，苞片（长在花的底部，形状或颜色或不同于主叶）
Poinsettias arepopularfortheirattractiveredbracts.一品红因其迷人的红色苞片广受喜爱。
picture of bract
espy3008/iStock/Getty Images Plus/Getty Images /GettyImages
SMART Vocabulary: related words and phrases
Parts of plants
  • bilobed
  • blade
  • bough
  • bulb
  • calyx
  • caning
  • cascara sagrada
  • endodermis
  • needle
  • outgrowth
  • rhizome
  • simple leaf
  • spine
  • tea leaf
  • trunk
  • variegated
  • variegation
  • vascular
  • veined
  • vesicle
See more results »
(Definition ofbractfrom theCambridge Advanced Learner's Dictionary & Thesaurus© Cambridge University Press)

Examplesofbract

bract
The verticalbracttips are about 2 mm long.
From theCambridge English Corpus
Five whorls of bracts subtending sporangia are visible.
From theCambridge English Corpus
The leaf-like bracts on this cone are almost indistinguishable from the normal vegetative leaves, except they are more curved towards the stem.
From theCambridge English Corpus
When receptive, the stigmas release a species-specific fragrance, and the bracts in the neck of the inflorescence loosen, allowing the pollinators to enter.
From theCambridge English Corpus
Seeds were germinated in their fruiting bracts or afterbractremoval.
From theCambridge English Corpus
In each experimental patch, 10 plants had a redbractadded, 10 plants had a greenbractadded and five plants had nobract.
From theCambridge English Corpus
For eachbracttreatment values for the species are means of three temperatures.
From theCambridge English Corpus
Due to the obliqueness of the section, bracts of the whorl above appear individualized.
From theCambridge English Corpus
The number of bracts is unknown due to poor preservation.
From theCambridge English Corpus
Individual growth was measured as the number of new leaves and floral bracts produced per individual.
From theCambridge English Corpus
On female trees each inflorescence is solitary and consists of a single pedunculate flower surrounded by a whorl of bracts c. 7 mm long.
From theCambridge English Corpus
On the male trees inflorescences are often in fascicles, and with each inflorescence a whorl of bracts surrounds a capitulum of apetalous male flowers.
From theCambridge English Corpus
The bracts are red and flower colour is uniformly violet.
From theCambridge English Corpus
The hibernacula are located in flower bracts, under lichens, loose bark and on other tree parts, which are relatively exposed to ambient weather conditions.
From theCambridge English Corpus
In both seasons, seeds were germinated either in their fruiting bracts (fruits) or after handremoval of the fruiting bracts.
From theCambridge English Corpus
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
#https://dictionary.cambridge.org//dictionary/english/bract##
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更新时间：2024/12/27 22:58:59