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1 τρίγωνος
A three-cornered, triangular, τὴν τ. ἐς χθόνα Νειλῶτιν, of the Delta, A.Pr. 813;τ. ῥυθμοί Id.Fr.78
; ; of the hearts of certain fish, Arist.Frr. 314, 330, 333; of Sicily, Plb.1.42.3; of Britain, Str.4.5.1.2 ἀριθμοὶ τρίγωνοι, triangular numbers, are those whose units can be disposed in a triangle, as 3 <*>, 6 <*>, etc., being represented by the formula n(n + 1)/2, Plu.2.1003f, cf. Nicom.Ar.2.8; these numbers are also called triangles ([etym.] τρίγωνοι), Plu. 2.744b.3 Astrol., in triangular or trine aspect, of planets when there are three signs of the zodiac between them, so that they are at the apices of an equilateral triangle, S.E.M.5.39, Plot.2.3.4;τ. σχηματισμοί Ptol.Tetr.35
, cf. Man.3.344.II as Subst., τρίγωνον, τό, triangle, Ti.Locr.98a, Pl.Ti. 50b, etc.2 a musical instrument of triangular form, with strings of equal thickness but unequal lengths, Eup.77, Pl.Com.69.13, Pl.R. 399c, Arist.Pol. 1341a41, Diog.Ath.1.9; called τ. ψαλτήρια in Arist.Pr. 919b12:—also as masc.,πολὺς δὲ Φρὺξ τρίγωνος S.Fr. 412
, cf. Ath.4.183e.3 one of the Athenian lawcourts, Din.Fr.89.35, Lycurg.Fr.10, Men.1076, Paus.1.28.8, Poll.8.121.4 the constellation Triangulum, Eudox. ap. Hipparch.1.2.13.5 τρίγωνος, ἡ, name of a lozenge, Orib.Syn.3.183; as masc., Paul.Aeg.7.12.Greek-English dictionary (Αγγλικά Ελληνικά-λεξικό) > τρίγωνος
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