Are you a native English speaker? How do you pronounce this word?
n. - A unit of measurement of the refractive power of a lens which is equal to the reciprocal of the focal length measured in meters.
Tutoring comment not yet available...
LearnThatWord and the Open Dictionary of English are programs by LearnThat Foundation, a 501(c)3 nonprofit.
Questions? Feedback? We want to hear from you!
or click here for instant support.
Copyright © 2005 and after - LearnThat Foundation. Patents pending.