[ sem-ee-pur-mee-uh-buh l, sem-ahy- ]
/ ˌsɛm iˈpɜr mi ə bəl, ˌsɛm aɪ- /
permeable only to certain small molecules: a semipermeable membrane.
Does Bimonthly Mean Twice A Month Or Every Two Months?The prefix bi- usually means ‘every two’, so bimonthly means ‘every two months’.Semi- means ‘half’ or ‘halfway’, so semimonthly means ‘every two weeks’. However, bimonthly can also mean ‘twice a month’ – but it is rarely used that way. It is best to remember that bi- is “every two” and semi- is “halfway.”
Cyclone, Typhoon, Hurricane: Are They All The Same?Are hurricanes, cyclones and typhoons distinct meteorological phenomena, or just different names for the same horrible type of storm? Cyclones explained Let’s start with cyclone, since it has the clearest and most precise definition of the three. A cyclone is “a large-scale, atmospheric wind-and-pressure system characterized by low pressure at its center and by circular wind motion.” And cyclones spin “counterclockwise in the Northern Hemisphere, clockwise in the Southern Hemisphere.” …
- semipalmated plover,
- semipalmated sandpiper,
- semipolar bond,
Origin of semipermeable
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for semi-permeable
The term "osmotic membrane" should therefore in all cases replace that of "semi-permeable membrane."The Mechanism of Life|Stphane Leduc
/ (ˌsɛmɪˈpɜːmɪəbəl) /
(esp of a cell membrane) selectively permeable
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Online Etymology Dictionary, © 2010 Douglas Harper
[ sĕm′ē-pûr′mē-ə-bəl, sĕm′ī- ]
Allowing passage of certain, especially small, molecules or ions but acting as a barrier to others. Used of biological and synthetic membranes.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.