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Meaning of payload assist module

pay'load assist' mod"ule

Pronunciation: [key]
  1. a U.S. solid-propellant rocket used to boost a medium-weight spacecraft from a circular low-earth orbit to an elliptical transfer orbit for later insertion into a geosynchronous orbit. Abbr.: PAM Cf.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.