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  1. Oxford Dictionary

    theca

    • IPA[ˈθiːkə]

    英式

    • n.
      the loose sheath enclosing the spinal cord.；the outer layer of cells of a Graafian follicle.

    • noun: theca, plural noun: thecae

    • 釋義

    名詞

    • 1. the loose sheath enclosing the spinal cord.
    • ▪ the outer layer of cells of a Graafian follicle.
    • 2. a cuplike or tubular structure containing a coral polyp.
    • 3. either of the lobes of an anther, each containing two pollen sacs.