Bottom-quark
the quark having electric charge −1/3 times the elementary charge and bottom quantum number −1. It is more massive than the up, down, strange, and charmed quarks.
bottom quark
(bŏt’əm)
A quark with a charge of – 1/3 . Its mass is smaller than that of the top quark, but larger than that of all the other quarks. The bottom quark is sometimes referred to as the beauty quark, though this term is falling out of use. See Table at subatomic particle.
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of, relating to, or originating with the common people, nonprofessionals, or the lower ranks of an organization: The five-day workweek was a bottom-up movement some business leaders and politicians finally supported. Contemporary Examples Republicans Push Back as Rove Aims to Appoint Himself Kingmaker Lloyd Green February 9, 2013 Trying to Identify the Next Far-Right Extremist […]
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a programming technique in which lower-level modules are developed before higher-level modules.
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Slang. bottom lady. a pimp’s most reliable prostitute. a female pimp. the madam of a brothel.