τετράς

Ancient Greek

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

τετρᾰ́ς • (tetrắs) 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)

Third declension of ἡ τετρᾰ́ς; τῆς τετρᾰ́δος (Attic)

Case / #	Singular	Dual	Plural
Nominative	ἡ τετρᾰ́ς hē tetrắs	τὼ τετρᾰ́δε tṑ tetrắde	αἱ τετρᾰ́δες hai tetrắdes
Genitive	τῆς τετρᾰ́δος tês tetrắdos	τοῖν τετρᾰ́δοιν toîn tetrắdoin	τῶν τετρᾰ́δων tôn tetrắdōn
Dative	τῇ τετρᾰ́δῐ tēî tetrắdĭ	τοῖν τετρᾰ́δοιν toîn tetrắdoin	ταῖς τετρᾰ́σῐ / τετρᾰ́σῐν taîs tetrắsĭ(n)
Accusative	τὴν τετρᾰ́δᾰ tḕn tetrắdă	τὼ τετρᾰ́δε tṑ tetrắde	τᾱ̀ς τετρᾰ́δᾰς tā̀s tetrắdăs
Vocative	τετρᾰ́ς tetrắs	τετρᾰ́δε tetrắde	τετρᾰ́δες tetrắdes
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