Partial opacity of the lens.
DansGameRead more in this article about some frequently asked questions and fun facts related to our definitions.
What Does “Sophomore” Mean?Of the four tiers of high school, sophomore is the year that stands out as strange. Freshman, junior, and senior are relatively clear monikers for their associated levels, and it’s funny that in school, the place where you are most expected to know the how and why of everything, second-year students are called by a term whose roots are abstruse. Then there is the problem …
- ion exchange,
- ion exchanger,
- ion generator,
- ion implantation,
- ion propulsion
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.