Etymology
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Words related to chill

*gel- 

Proto-Indo-European root meaning "cold; to freeze." 

It forms all or part of: chill; cold; congeal; cool; gel; gelatine; gelatinous; gelato; gelid; glace; glacial; glaciate; glaciation; glacier; glaciology; glacis; jell; jelly.

It is the hypothetical source of/evidence for its existence is provided by: Latin gelare "to freeze," gelu "frost," glacies "ice;" Old English cald "cold, cool," German kalt.

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chilblain (n.)

"cold-sore," 1540s, from chill (n.) + blain "inflamed swelling or sore on skin." Related: Chilblains.

chilly (adj.)

1560s, "causing a sensation of cold," from chill (n.) + -y (2). Meaning "feeling coldish" is attested from 1610s; figurative sense of "distant, formal, not hearty or affectionate" is by 1841. Related: Chilliness. Earlier as an adjective was simply chill "tending to cause shivering" (1510s).

spine-chiller (n.)
"mystery film," 1940, from spine + agent noun from chill (v.). Spine-tingler in same sense is from 1942.