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单词 trefoil
释义
trefoil

Mathematics
  • The simplest knot which has 3 crossings and which has left-hand and right-hand forms. For a figure, see chirality.


Science and Technology
  • An annual, biennial, or short-lived perennial herb of the genus Trifolium (family Fabaceae) that has trifoliate leaves and dense, raceme-like flower heads. There are about 300 species distributed worldwide, many grown as fodder crops, e.g. white clover (T. pratense) and red clover (T. repens).

    Mike Allaby


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