Etymology
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lymph (n.)

in physiology, "colorless fluid found in animal bodies," 1725, from French lymphe (16c.), from Latin lympha "water, clear water, a goddess of water," variant of lumpæ "waters," altered by influence of Greek nymphē "goddess of a spring, nymph."

The same word was used earlier in English in the classical sense "pure water, water" (1620s) and with reference to colorless fluids in plants (1670s). Also see lymphatic. Lymph node is attested by 1874.

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lymphoma (n.)

plural lymphomata, 1867, from lympho- (see lymph) + -oma.

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lymphocyte (n.)

cell found in the lymph, 1890, from lympho- "lymph" (see lymph) + -cyte "a cell."

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lymphadenopathy (n.)

1899, from lymphadeno- "pertaining to a lymph gland" (from lymph + Greek adēnos, genitive of adēn "gland") + -pathy. Lymphadenoma is from 1870.

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lymphatic (adj.)
1640s, from Modern Latin lymphaticus "pertaining to the lymph," from Latin lympha (see lymph). The English word also sometimes is used in what was the primary sense of lymphaticus in classical Latin, "mad, frenzied." OED reports this meaning "difficult to account for," but perhaps due to association of lympha with nymphe; compare Greek nymphian "to be frenzy-stricken." Also sometimes in reference to the appearance or temperament of one thought to suffer from excess of lymph, "dull, sluggish, slow in thought or action, with flabby muscles and pale skin" (1834).
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limpid (adj.)

c. 1600, from French limpide (15c.) and directly from Latin limpidus "clear, transparent" (source also of Spanish límpido, Italian limpido), related to limpor "a clear liquid," limpa "water goddess, water," which is perhaps cognate with lympha "clear liquid" (see lymph). Related: Limpidly.

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vas (n.)
in anatomy, "a tube, duct, or conduit for conveying blood, lymph, semen, etc.," plural vasa, Latin, literally "vessel." Vas deferens (plural vasa defferentia) is from 1570s.
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bubo (n.)
"inflamed swelling in the glands," late 14c., plural buboes, from Late Latin bubo (genitive bubonis) "swelling of lymph glands" (in the groin), from Greek boubon "the groin, swelling in the groin," a word of unknown origin.
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bubonic (adj.)
"characterized by swelling in the groin," by 1795, from Latin bubo (genitive bubonis) "swelling of lymph glands" (in the groin), from Greek boubon "the groin; swelling in the groin" (which is of unknown origin) + -ic. Bubonic plague attested by 1827.
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leukocyte (n.)
also leucocyte, "white blood cell, white or colorless corpuscle of the blood or lymph," 1860, via French leucocyte, from leuco-, a Latinized combining form of Greek leukos "white, clear," from PIE root *leuk- "light, brightness" + -cyte "cell."
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