τετράς

Ancient Greek

From Proto-Indo-European *kʷetwóres (whence also τέσσαρες (téssares, “four”)) + -ᾰ́ς (-ás).

τετρᾰ́ς • (tetrás) f (genitive τετρᾰ́δος); third declension

the number four
1. the fourth day of the month
2. the fourth day of the week
3. a period of four days
4. the four quarters of the moon
tetrarchy
four-leaved pamphlet, quaternion
Synonym: τετράδιον (tetrádion)

Case / #	Singular	Dual	Plural
Nominative	ἡ τετρᾰ́ς hē tetrás	τὼ τετρᾰ́δε tṑ tetráde	αἱ τετρᾰ́δες hai tetrádes
Genitive	τῆς τετρᾰ́δος tês tetrádos	τοῖν τετρᾰ́δοιν toîn tetrádoin	τῶν τετρᾰ́δων tôn tetrádōn
Dative	τῇ τετρᾰ́δῐ têi tetrádi	τοῖν τετρᾰ́δοιν toîn tetrádoin	ταῖς τετρᾰ́σῐ / τετρᾰ́σῐν taîs tetrási(n)
Accusative	τὴν τετρᾰ́δᾰ tḕn tetráda	τὼ τετρᾰ́δε tṑ tetráde	τᾱ̀ς τετρᾰ́δᾰς tā̀s tetrádas
Vocative	τετρᾰ́ς tetrás	τετρᾰ́δε tetráde	τετρᾰ́δες tetrádes
Notes:	This table gives Attic inflectional endings. For declension in other dialects, see Appendix:Ancient Greek dialectal declension. Nominative singular -ς (-s) arose by reduction of the original cluster *-ds.

“τετράς”, in Liddell & Scott (1940) A Greek–English Lexicon, Oxford: Clarendon Press
“τετράς”, in Liddell & Scott (1889) An Intermediate Greek–English Lexicon, New York: Harper & Brothers
τετράς in Bailly, Anatole (1935) Le Grand Bailly: Dictionnaire grec-français, Paris: Hachette
Sophocles, Evangelinos Apostolides (1900) “τετράς”, in Greek Lexicon of the Roman and Byzantine Periods (from B. C. 146 to A. D. 1100), New York: Charles Scribner’s Sons, page 1078b