valve
/vælv/noun
1- a device for controlling the passage of fluid through a pipe or duct, especially an automatic device allowing movement in one direction only阀, 活门, 气门。
1.1
- Brit. short for THERMIONIC VALVE.〈英〉THERMIONIC VALVE的简称。
1.2
- Music a cylindrical mechanism in a brass instrument which, when depressed or turned, admits air into different sections of tubing and so extends the range of available notes【乐】（铜管乐器的）阀键。
1.3
- Anatomy & Zoology a membranous fold in a hollow organ or tubular structure, such as a blood vessel or the digestive tract, which maintains the flow of the contents in one direction by closing in response to any pressure from reverse flow【剖, 动】瓣膜, 瓣。
1.4
- Zoology each of the halves of the hinged shell of a bivalve mollusc or brachiopod, or of the parts of the compound shell of a barnacle【动】壳板。
1.5
- Botany each of the halves or sections into which a dry fruit (especially a pod or capsule) dehisces【植】裂爿。
派生词
valved
adjective腕足动物有一个两块壳板的外壳。
valveless
adjective词源
late Middle English (denoting a leaf of a folding or double door)： from Latin valva.