Etymology
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techno- 

word-forming element meaning "art, craft, skill," later "technical, technology," from Latinized form of Greek tekhno-, combining form of tekhnē "art, skill, craft in work; method, system, an art, a system or method of making or doing," from PIE *teks-na- "craft" (of weaving or fabricating), from suffixed form of root *teks- "to weave," also "to fabricate."

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tele- 

before vowels tel-, word-forming element meaning "far, far off, operating over distance" (also, since c. 1940, "television"), from Greek tele "far off, afar, at or to a distance," related to teleos (genitive telos) "end, goal, completion, result," from PIE root *kwel- (2) "far" in space or time.

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ter- 

word-forming element meaning "thrice, three times," from Latin ter "thrice," from *tris-, from root of three. Compare Latin tertius "third."

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tera- 

prefix meaning "trillion," used in forming large units of measure (such as terabyte), officially adopted 1947, from Greek teras "marvel, monster" (see terato-).

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tetra- 

before vowels tetr-, word-forming element meaning "four," from Greek tetra-, combining form of tettares (Attic), tessares "the numeral four" (from PIE root *kwetwer- "four").

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thalasso- 

before vowels thalass-, word-forming element meaning "sea, the sea," from Greek thalassa "the sea" (in Homer, when used of a particular sea, "the Mediterranean," as opposed to ōkeanos), a word from the Pre-Greek substrate language. In Attic Greek thalatta, hence sometimes thalatto-.

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thanato- 

before vowels thanat-, word-forming element meaning "death," from Greek thanatos "death," from PIE *dhwene- "to disappear, die," perhaps from a root meaning "dark, cloudy" (compare Sanskrit dhvantah "dark"). Hence Bryant's "Thanatopsis", with Greek opsis "a sight, view."

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theco- 

before vowels thec-, word-forming element used in botany and zoology with the sense "case, capsule," from Latinized combining form of Greek thēkē "case, receptacle," from PIE *dhek-, suffixed form of root *dhe- "to set, put."

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theo- 

word-forming element meaning "god, gods, God," from Greek theos "god," from PIE root *dhes-, forming words for religious concepts, such as Latin feriae "holidays," festus "festive," fanum "temple."

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ther- 

often thero-, word-forming element meaning "beast," from Greek thēr "wild beast, beast of prey," from PIE root *ghwer- "wild beast." Also therio-, from Greek thērion "wild animal, hunted animal."

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