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 ?
Modular buildings qualify as personal property because of their portable and relocatable features, so contracts for modular buildings may be piggybacked and are exempt from the competitive bidding process.
Piggyback loans -- so called because a second mortgage is piggybacked on to a first to compensate for a smaller down payment -- have become common in recent years as housing prices have appreciated.
While other organizations offer fiber optic calibration services, these capabilities are often piggybacked onto existing scopes of calibration.