Valve

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GRE TOEFL 考研

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[编辑] GRE 红宝书

  • n.活门, 阀门
  • [英] 活门, 阀门 ( a structure that closes temporarily a passage or orifice or permits movement of fluid in one direction only)
  • [类] liquid : valve / electric current : switch ( 液体用阀门控制 / 电流用开关控制)

[编辑] Webster Collegiate

noun

  • Etymology: Latin valva; akin to Latin volvere to roll — more at voluble
  • Date: 14th century
  • 1. archaic a leaf of a folding or double door
  • 2. \[New Latin valva, from Latin\] a bodily structure (as the mitral valve) that closes temporarily a passage or orifice or permits movement of fluid in one direction only
  • 3.
    • a. any of numerous mechanical devices by which the flow of liquid, gas, or loose material in bulk may be started, stopped, or regulated by a movable part that opens, shuts, or partially obstructs one or more ports or passageways; also the movable part of such a device
    • b. a device in a brass instrument for quickly channeling air flow through an added length of tube in order to change the fundamental tone by some definite interval
    • c. chiefly British electron tube
  • 4. \[New Latin valva, from Latin\] one of the distinct usually hinged and movable pieces of which the shell of some shell-bearing animals (as lamellibranch mollusks, brachiopods, and barnacles) consists
  • 5. \[New Latin valva, from Latin\]
    • a. one of the segments or pieces into which a dehiscing capsule or legume separates
    • b. the portion of various anthers (as of the barberry) resembling a lid
    • c. one of the two encasing membranes of a diatom
  • ? valved adjective
  • ? valveless adjective


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