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The Collaborative International Dictionary of English v.0.48 (gcide)

Reins \Reins\ (r[=a]nz), n. pl. [F. rein, pl. reins, fr. L. ren,
pl. renes.]
1. The kidneys; also, the region of the kidneys; the loins.
[1913 Webster]

2. 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.
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My reins rejoice, when thy lips speak right things.
--Prov. xxiii.
16.
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I am he which searcheth the reins and hearts. --Rev.
ii. 23.
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{Reins of a vault} (Arch.), the parts between the crown and
the spring or abutment, including, and having especial
reference to, the loading or filling behind the shell of
the vault. The reins are to a vault nearly what the
haunches are to an arch, and when a vault gives way by
thrusting outward, it is because its reins are not
sufficiently filled up.
[1913 Webster]