ῥᾰχ-ις, ιος,
Attic dialect εως, ἡ (but ὁ [[ “IG” 42 (see. below))] Refs], the lower part of the back, the chine, συὸς ῥ. [[ 8th c.BC: Ilias Homerus Epicus “Illiad” 9.208. ] Refs 8th c.BC+]
__2 spine or backbone, σύγκειται ἡ ῥ. ἐκ σφονδύλων, τείνει δ᾽ ἀπὸ τῆς κεφαλῆς μέχρι πρὸς τὰ ἰσχία [[ 4th c.BC: Aristoteles Philosophus “Historia Animalium” 516a11, compare “PA” 654b12, +others] Refs 4th c.BC+]; ὑπὸ ῥάχιν παγέντες impaled, [[ 4th-5th c.BC: Aeschylus Tragicus “Eumenides” 190, compare 5th c.BC: Sophocles Tragicus “Fragmenta” 20, 5th c.BC: Euripides Tragicus “Cyclops” 643 ] Refs 5th c.BC+]; μυελὸς κοίλης ῥάχεως Archel. cited in [[ 3rd c.BC: Antigonus Carystius Paradoxographus “Mirabilia” 89, compare 5th-6th c.BC: Plato Philosophus “Timaeus” 77d, 91a. ] Refs 5th c.BC+]
__II anything ridged like the backbone:
__II.1 ridge of a hill or mountain, [[ 5th c.BC: Herodotus Historicus 3.54, 7.216, “IG” 42(1).71.14 (Epid., 3rd c.BC), 2nd c.BC: Polybius Historicus 3.101.2, 1st c.BC: Dionysius Halicarnassensis 5.44, 1st c.BC-1st c.AD: Strabo Geographus 3.2.3 (_plural_)] Refs 5th c.BC+]; ἂν ῥάχιν along the ridge, [[ “GDI” 5075.69 (Crete, 2nd c.BC)] Refs 2nd c.BC+]; so [[ 7th c.BC: Archilochus Lyricus 21 like ned Thasos to an ὄνου ῥάχις. ] Refs 7th c.BC+]
__II.2 ῥ. ῥινός bridge of the nose, [[ 2nd c.AD(?): Pollianus Epigrammaticus 2.79, 2nd c.AD: Rufus Medicus “περὶ ὀνομασίας” 35. ] Refs 2nd c.AD+]
__II.3 ῥ. φύλλου mid-rib of a leaf, [[ 4th-3rd c.BC: Theophrastus Philosophus “Historia Plantarum” 3.7.5, +others ] Refs 4th c.BC+]