from The American Heritage® Dictionary of the English Language, 4th Edition
- n.pl. The kidneys, loins, or lower back.
- n.pl. The seat of the affections and passions.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The kidneys.
- n. The lower part of the back.
- n. Plural form of rein.
- v. Third-person singular simple present indicative form of rein.
from the GNU version of the Collaborative International Dictionary of English
- n.pl. The kidneys; also, the region of the kidneys; the loins.
- n.pl. The inward impulses; the affections and passions; -- so called because formerly supposed to have their seat in the part of the body where the kidneys are.
from The Century Dictionary and Cyclopedia
- The kidneys or renes.
- Hence The region of the kidneys; the loins, or lower parts of the back on each side.
- The seat of the affections and passions, formerly supposed to be situated in that part of the body; hence, also, the emotions and affections themselves.
Middle English, from Old French, from Latin rēnēs.(American Heritage® Dictionary of the English Language, Fourth Edition)
French reins, see rein in French. (Wiktionary)