英语词汇“bract”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

bract

/brakt

noun 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.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....

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.
Grasses and bamboos are known to have large deposits of silica in the tissues of leaf blades and inflorescence bracts.

单词	bract
释义	bract /brakt / noun 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.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.... 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. Grasses and bamboos are known to have large deposits of silica in the tissues of leaf blades and inflorescence bracts. Derivatives bracteal adjective 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
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bract

Derivatives

bracteal

Origin

Rhymes