Floating ribs

Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.
(Anat.) the lower or posterior ribs which are not connected with the others in front; in man they are the last two pairs.

See also: Floating

References in classic literature ?
There are twelve ribs, you know, and the two lower ones are called floating ribs, because they are not fastened to the breastbone.
Describing the warrior who began the onslaught he writes: "He howled and arched his back and drove his spear into the white man's floating ribs.