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单词 perisperm
释义

Definition of perisperm in English:

perisperm

noun ˈpɛrɪspəːm
Botany

  • (in some seeds) a mass of nutritive material outside the embryo sac.

    〔植〕（某些种子的）外胚乳

    Example sentencesExamples
    • The perisperm is present in abundance.
    • In cucumber, muskmelon, and other seeds, a thin perisperm-endosperm envelope completely encloses the embryo.
    • Scarification was accomplished by piercing the seed coat and scraping a small portion of the perisperm with a sterile dissecting needle.
    • They were treated with 65% sulfuric acid for 10 min at room temperature to hydrolyse their impermeable waterproofing perisperm.
    • Almost all of the seeds have popped along their long axis due to the swelling of the starchy perisperm during heating.

Origin

Early 19th century: from peri- 'around' + Greek sperma 'seed'.
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更新时间：2025/2/6 23:17:23