a white to yellow star, as Canopus, Polaris, or Procyon, having a surface temperature between 6000 and 7500 K and an absorption spectrum in which the pair of ultraviolet lines of singly ionized calcium and the Balmer series of hydrogen are of about equal strength.
[ef-stop] /ˈɛfˌstɒp/ noun, Photography. 1. the setting of an adjustable lens aperture, as indicated by an f number. noun 1. any of the settings for the f-number of a camera
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1. Florida State University 2. former Soviet Union