We report a measurement of $e^+e^-$ pairs from semileptonic heavy-flavor decays in $d$$+$Au collisions at $sqrt{s_{_{NN}}}=200$ GeV. Exploring the mass and transverse-momentum dependence of the yield, the bottom decay contribution can be isolated from charm, and quantified by comparison to {sc pythia} and {sc mc@nlo} simulations. The resulting $bbar{b}$-production cross section is $sigma^{d{rm Au}}_{bbar{b}}=1.37{pm}0.28({rm stat}){pm}0.46({rm syst})$~mb, which is equivalent to a nucleon-nucleon cross section of $sigma^{NN}_{bb}=3.4pm0.8({rm stat}){pm}1.1({rm syst}) mu$b.
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