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RIG'OR, noun [Latin from rigeo, to be stiff.

1. Stiffness; rigidness; as Gorgonian rigor

2. In medicine, a sense of chilliness, with contradiction of the skin; a convulsive shuddering or slight tremor, as in the cold fit of a fever.

3. Stiffness of opinion or temper; severity; sternness.

All his rigor is turned to grief and pity.

4. Severity of life; austerity; voluntary submission to pain, abstinence or mortification.

5. Strictness; exactness without allowance, latitude or indulgence; as the rigor of criticism; to execute a law with rigor; to enforce moral duties with rigor

6. violence; fury. [Not in use.]

7. Hardness; solidity. [Unusual.]

8. Severity; asperity; as the rigors of a cold winter.