Old English clæg "stiff, sticky earth; clay," from Proto-Germanic *klaijaz (source also of Old High German kliwa "bran," German Kleie, Old Frisian klai, Old Saxon klei, Middle Dutch clei, Danish klæg "clay;" also Old English clæman, Old Norse kleima, Old High German kleiman "to cover with clay").
Some sources see these as being from a common PIE root meaning "slime; glue" also forming words for "clay" and verbs for "stick together." Compared words include Latin gluten "glue, beeswax;" Greek gloios "sticky matter;" Lithuanian glitus "sticky," glitas "mucus;" Old Church Slavonic glina "clay," glenu "slime, mucus;" Old Irish glenim "I cleave, adhere;" Old English cliða "plaster." But Beekes writes that "Not all comparisons are convincing," and notes that most words cited are from Balto-Slavic or Germanic, "which suggests European substrate origin."
In Scripture, the stuff from which the body of the first man was formed; hence "human body" (especially when dead). As an adjective, "formed of clay," 1520s. Clay-pigeon "saucer of baked clay used as a flying target in trap-shooting," in place of live birds, is from 1881. Feet of clay "fundamental weakness" is from Daniel ii.33.
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