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 ?
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.
The gold particles are unaffected by the magnetic field, so they came out of the sample only when piggybacked on ADDLs.
Worms are far more insidious than online viruses transmitted as e-mail attachments or piggybacked on infected disks.