Etymology
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Themis 
Greek goddess of law and justice, the name means "custom, right," literally "that which is laid down or established" (by custom); also "laws, ordinances," but closer in sense to Latin ius (see jurist) than to lex (see legal); related to thema "proposition; that which is placed" (see theme).
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Thermos (n.)
trademark registered in Britain 1907, invented by Sir James Dewar (patented 1904 but not named then), from Greek thermos "hot" (from PIE root *gwher- "to heat, warm"). Dewar built the first one in 1892, but it was first manufactured commercially in Germany in 1904, when two glass blowers formed Thermos GmbH. Supposedly the company sponsored a contest to name the thing, and a Munich resident won with a submission of Thermos.
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Themistocles 
name of great Athenian political leader, from Greek Themistokles, literally "famed in law and right," from themis "custom, law, right" (see Themis) + -kles "fame," a common ending in Greek proper names, related to kleos "rumor, report, news; good report, fame, glory," from PIE *klew-yo-, suffixed form of root *kleu- "to hear."
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Thea 
fem. proper name, from Greek thea "goddess," fem. equivalent of theos "god" (from PIE root *dhes-, forming words for religious concepts).
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Theobald 
masc. proper name, from Medieval Latin Theobaldus, from Old High German Theudobald, from theuda "folk, people" (see Teutonic) + bald "bold" (see bold). Form influenced in Medieval Latin by the many Greek-derived names beginning in Theo-.
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Thessaly 

district south of Macedonia and east of Epirus, from Greek Thessalia (Attic Thettalia), an Illyrian name of unknown origin. Related: Thessalian. The city of Thessalonika on the Thermaic Gulf was ancient Therme, renamed when rebuilt by the Macedonian king Cassander, son of Antipater, and named in honor of his wife, Thessalonica, half-sister of Alexander the Great, whose name contains the region name and Greek nikē "victory." The adjectival form of it is Thessalonian Related: Thessalonians.

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Theodore 

masc. proper name, from Latin Theodorus, from Greek Theodoros, literally "gift of god," from theos "god" (from PIE root *dhes-, forming words for religious concepts) + dōron "gift" (from PIE root *do- "to give"). The fem. form is Theodora.

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Theophilus 
masc. proper name, Latinized form of Greek Theophilos, literally "dear to God; loved by the gods," from theos "god" (from PIE root *dhes-, forming words for religious concepts) + philos "loved, beloved" (see -phile).
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Theodoric 
masc. proper name, from Late Latin Theodoricus, from Gothic, literally "ruler of the people," from Gothic þiuda "people" (see Teutonic) + *reiks "ruler" (see Reich). For spelling, see Theobald. The French form of the name, via the Franks, is Thierry.
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Theodosia 
fem. proper name, from Greek Theodosia, literally "gift of the gods," from theos "god" (from PIE root *dhes-, forming words for religious concepts) + dosis "a giving," from stem of didonai "to give" (from PIE root *do- "to give").
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