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bottom
bottom dead-centre
bottom drawer
bottom feeder
bottom fishing
bottom line
bottom-of-the-harbour scheme
bottom out
bottom quark
bottom round
bottom seed
bottom-up investing
bottomland
bottomless
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bottomset bed
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bottom quark
bottom quark (plural bottom quarks)


noun 
Definition:
 
quark with -1/3 electric charge: a quark with an electric charge of -⅓, zero charm, zero isotopic spin, and zero strangeness
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