单词	semipermeable
释义	semipermeable adjective semi·​per·​me·​able ˌse-mē-ˈpər-mē-ə-bəl  ˌse-ˌmī-, -mi- : partially but not freely or wholly permeable specifically : permeable to some usually small molecules but not to other usually larger particles a semipermeable membrane semipermeability ˌse-mē-ˌpər-mē-ə-ˈbi-lə-tē  ˌse-ˌmī- -mi- noun Example Sentences Recent Examples on the Web There’s a drainage line at the bottom, often under a semipermeable polymer layer that forms a firm bottom to the bunker and prevents rocks and soil from coming up during freeze-thaw cycles. Bradley S. Klein, WSJ, 17 June 2022 Specialized cells within the eel’s electric organ pump ions across a semipermeable membrane barrier to produce an electrical charge difference between the inside versus the outside of the membrane. Timothy J. Jorgensen, The Conversation, 9 May 2022 The second is whether the virus can gain access to the brain, which is protected by a semipermeable barrier that can block out pathogens and other harmful particles while still allowing nutrients and other key molecules to make it through. Los Angeles Times, 5 May 2021 These cytokines are seemingly able to cross the semipermeable network of capillaries that connect the brain to the rest of the body (known as the blood-brain barrier). Claire Maldarelli, Popular Science, 22 Feb. 2018 Well, egg shells are semipermeable, and the older the egg, the more air can get through the shell, which explains why old eggs float. Kelsey Hurwitz, Woman's Day, 2 May 2020 The process of moving water across a semipermeable membrane is called osmosis. Svenja Lohner, Scientific American, 9 Jan. 2020 By pumping the positive ions—like sodium or potassium—to the other side of a semipermeable membrane, researchers can create two pools of water: one with a positive charge, and one with a negative charge. Robert F. Service, Science | AAAS, 4 Dec. 2019 The semipermeable membranes were sheets of purple celluloid Gonzaga students had ordered from England, 135 square yards of it, at a cost of $300. John Kelly, Washington Post, 5 Aug. 2019 See More Word History First Known Use 1888, in the meaning defined above Medical Definition semipermeable adjective semi·​per·​me·​able ˌsem-i-ˈpər-mē-ə-bəl, ˌsem-ˌī-  : partially but not freely or wholly permeable specifically : permeable to some usually small molecules but not to other usually larger particles a semipermeable membrane
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