piggyback

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piggyback

 [pig´e-bak″]
supplementary or added on; used to refer to an intravenous infusion.

pig·gy·back

(pigē bak)
A supplemental infusion set added to a main intravenous line for the intermittent administration of drugs.
References in periodicals archive ?
Such an approach could provide equal treatment to spousal authorized-user accounts without requiring it for all authorized-user accounts (including piggybacked accounts).
And June marked the 11th anniversary of Queerstock, the loose-knit festival that historically has piggybacked on pride events nationwide.
"Our battalion piggybacked on a Joint Logistics Over The Shore mission with SDDC last year and we learned a lot, so we're looking for similar opportunities."
Piggybacks: Piggyback loans--in which a second loan is piggybacked on a first mortgage to compensate for a down payment of less than 20 percent--are used primarily to support the purchase of housing in high-cost areas, where purchasing a house requires a larger loan.