Chill n.
 1. A moderate but disagreeable degree of cold; a disagreeable sensation of coolness, accompanied with shivering. “[A] wintry chill.”
 2. Med. A sensation of cold with convulsive shaking of the body, pinched face, pale skin, and blue lips, caused by undue cooling of the body or by nervous excitement, or forming the precursor of some constitutional disturbance, as of a fever.
 3. A check to enthusiasm or warmth of feeling; discouragement; as, a chill comes over an assembly.
 4. An iron mold or portion of a mold, serving to cool rapidly, and so to harden, the surface of molten iron brought in contact with it.
 5. The hardened part of a casting, as the tread of a car wheel.
 Chill and fever, fever and ague.