Etymology
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Words related to somato-

*teue- 
*teuə-, also *teu-, Proto-Indo-European root meaning "to swell."

It forms all or part of: butter; contumely; creosote; intumescence; intumescent; protuberance; protuberant; psychosomatic; somato-; -some (3) "body, the body;" soteriology; Tartuffe; thigh; thimble; thousand; thole (n.); thumb; tumescent; tumid; tumor; truffle; tuber; tuberculosis; tumult; tyrosine.

It is the hypothetical source of/evidence for its existence is provided by: Avestan tuma "fat;" Greek tylos "callus, lump;" Latin tumere "to swell," tumidus "swollen," tumor "a swelling;" Lithuanian tukti "to become fat;" Lithuanian taukas, Old Church Slavonic tuku, Russian tuku "fat of animals;" Old Irish ton "rump."
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psychosomatic (adj.)

1847, "pertaining to the relation between mind and body; relating to both soul and body," from Greek psykhē "mind" (see psyche) + sōmatikos, from sōma (genitive sōmatos) "body" (see somato-). Applied from 1938 to physical disorders with psychological causes. Etymologically, it could as easily apply to emotional disorders with physical causes, but it is rarely so used.

ribosome (n.)

1958, coined by U.S. microbiologist Richard B. Roberts (1910-1980) from ribo(nucleic acid) + -some "body" (see somato-). Related: Ribosomal.

schistosomiasis (n.)

1906, from schistosome (1905), from Modern Latin Schistosoma, from Greek skhistos "divided, cloven" (see schist) + sōma "body" (see somato-).

somatic (adj.)

"pertaining to the body" (as distinct from the soul, spirit, or mind), 1775, from French somatique and directly from Latinized form of Greek sōmatikos "of the body," from sōma (genitive sōmatos) "the body" (see somato-).

somatization (n.)
1909 in biology (Rignano); 1920 in psychology; from somato- "body" + -ization.
-some (3)

word-forming element meaning "the body," Modern Latin, from Greek sōma "the body" (see somato-).