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any rib of the lower two pairs of ribs in man, which are not attached to the breastbone
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
floating rib[¦flōd·iŋ ′rib]
One of the last two ribs in humans which have the anterior end free.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.