Quick Definition
ὀρθός, ή, όν Adj upright, straight
Strong's Definition
right (as rising), i.e. (perpendicularly) erect (figuratively, honest), or (horizontally) level or direct
Derivation: probably from the base of G3735 (ὄρος);
KJV Usage: straight, upright
UBS Dictionary of the Greek New Testament
adjc. | -ή, -όν | ἀνορθόω · διόρθωμα · διόρθωσις · ἐπανόρθωσις · ἐπιδιορθόω · ὀρθοποδέω · ὀρθοτομέω · ὀρθῶς
79.88 · Features of Objects · Straight, Crooked
straight, direct pertaining to being straight in contrast to what is crooked The context of HEB 12:13 is, of course, figurative.
41.30 · Behavior and Related States · Particular Patterns of Behavior
Collocation: τροχιὰς ὀρθὰς ποιέω τοῖς ποσίν
to live, to behave, to conduct oneself correctly (an idiom, literally: to make straight wheel tracks for the feet) to live or behave in strict conformance to a predetermined model for behavior
1 In earlier Greek ὀρθός meant straight up and down while εὐθύς meant straight on the horizontal plane, but this distinction has not always been preserved in Koine Greek.
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
ὀρθός, -7, -dv, (OPQ, ὄρνυμι [to stir up, set in motion; ace. to al. fr. τ. to lift up; ef. Fick iii. p. 775; Vanitek p- 928; Curtius p. 348]), straight, erect; i. e. a. upright: ἀνάστηθι, Acts xiv. 10; so with στῆναι in 1 Esdr. ix. 46, and in Grk. writ., esp. Hom. b. opp. to σκολιός, straight i. 6. not crooked: τροχιαί, Heb. xii. 13 (for Ww, Prov. xii. 15 ete.; [Pind., Theogn., al.]).
Mounce Concise Greek Dictionary
ὀρθός orthos 2x
erect, upright, Acts 14:10; plain, level, straight, Heb. 12:13*
Abbott-Smith Greek Lexicon
ὀρθός, -ή, -όν,
[in LXX chiefly for יָשָׁר;]
straight; in height, straight, upright: Ac 14:10;
in line, straight, direct: fig., He 12:13(LXX).†
Moulton & Milligan — Vocabulary of the Greek NT
ὀρθός is used of ‘‘standing” hay in P Lond ττ653 (ii/a.D.) (=III. p. 191) [χόρτ] χλωροῦ ὀρθοῦ : cf. 26. 755 werso# (iv/A.D.) (=IIL. p. 221) where ‘“‘standing’’ columns (ἑστῶτες corrected from ὀρθοί) are contrasted with those that have fallen (χαμαὶ κείμενοι). In Sy// 5408 (8.6. 175-1) ποιῶν ὀρθὰ πάντα πρὸς κανόνα διηνεκῆ, we have the meaning ‘‘straight.”” The metaphorical use of the adj. is seen in PSI V. 549%(B.C. 42-1) ὀρθὴ στήσομαι ἀπέναντί σου, with reference to the attitude of a servant to her mistress, and BGU I. 248% (i/A.p.: see 7d. 11. 594 note) διὰ γὰρ τὴν [σ]ὴ[ν] πρόν[ο]ια[ν] ἐν ὀρθῶι μέλλει γείνεσθαι (4 γίνεσθαι) : cf. P Oxy IIT, 490}5 (A.D. 124) καὶ ἔστιν μου ἡ σφραγὶς ᾿Αρποχράτου ὀρθοῦ, thesignature of a witness, Kaibel 307} μαρτύριον ὀρθοῦ βίου, and ΟΟ 15 32910 (mid. ii/B.c.) ἀπ᾽ ὀρθῆς, ‘‘ from the right” (way): Heb 12%. MGr ὀρθός (ὀρτός in Eastern dialects: Thumb Handbook p. 18), “straight,” “correct”; ‘‘steep.” The last meaning recalls the cognate Lat. avduzs: ὀρθός, however, had originally an initial, and probably also a medial, digamma (* Fop8s, * Fop0Fés) (Boisacq, p. 711).
Liddell-Scott-Jones — Greek-English Lexicon
ὀρθός (orthos) — upright. ὀρθός, ή, όν, straight,
I. in height, upright, standing, [Refs 8th c.BC+], who commonly joins it with στῆναι, στῆ δ᾽ ὀρθός [Refs 8th c.BC+]; ὀρθαὶ τρίχες ἔσταν [Refs 8th c.BC+]; ὀρθὸν οὖς ἵστησι pricks up his ear, [Refs 5th c.BC+]; applied to the erect posture of man, [Refs 4th c.BC+]; ὀ. θηρίον, of man, [Refs 4th c.BC+]; of buildings, standing with their walls entire, [τὸ Πάνακτον] ὀρθὸν παραδοῦναι [Refs 5th c.BC+]; of a standing crop, [Refs 2nd c.AD+] adverb, ὀρθῶς ἑστῶτες [Refs 4th c.BC+]
I. b Geometry texts, at right angles to.., εὐθεῖα πρὸς ἐπίπεδον ὀρθή ἐστιν ὅταν.. [Refs 3rd c.BC+]
I. c Astrology texts, ὀρθὰ ζῴδια signs which rise vertically, opposed to πλάγια, [Refs 2nd c.AD+]
II. in line, straight (opposed to σκολιός crooked and πλάγιος aslant), ἀντ᾽ ἠελίου τετραμμένος ὀρθός straight, right opposite the sun, [Refs 8th c.BC+]; ποιῶν ὀρθὰ πάντα πρὸς κανόνα [Refs 2nd c.BC+]; ὀ. τρῶμα longitudinal to the muscle, opposed to ἐπικάρσιος, [Refs 6th c.BC+]; ὀρθὴν κελεύεις, i. e. ὀρθὴν ὁδόν με ἰέναι κ., [Refs 5th c.BC+]; so ὀρθὴν ἄνω δίωκε (i.e. όδόν) [Refs 4th c.BC+]; δι᾽ ὀρθῆς τήνδε ναυκληρεῖς πόλιν (i.e. ὁδοῦ) [Refs 5th c.BC+]; εἰς ὀρθὸν ἀποδοῦναι to face the front originally held, [Refs 4th c.BC+]; also ὀρθᾷ χερί straightway, [Refs 5th c.BC+]; ὀρθῷ ποδί[Refs]; but τιθέναι ὀρθὸν πόδα is probably to put the foot out, as in walking, [Refs 5th c.BC+]
II.2. βλέπειν ὀρθά, opposed to being blind, [Refs 5th c.BC+]recovered his sight, [Refs 2nd c.AD+]; ἐξ ὀμμάτων ὀ.. κἀξ ὀρθῆς φρενός [Refs 5th c.BC+]
III. metaphorically,
III.1. right, safe, prosperous:
III.1. a partly from signification[Refs]set them up, restored, [Refs 5th c.BC+]; so ὀρθὸν ἀστάσας (= ἀναστήσας) [Refs 4th c.BC+]; ἐς ὀρθὸν ἱστάναι τινά [Refs 5th c.BC+]; ταύτης ἔπι (i.e. χθονός) πλέοντες ὀρθῆς (the state being represented as a ship) [Refs 5th c.BC+]
III.1. b partly from signification [Refs 5th c.BC+]; κατ᾽ ὀρθὸν οὐρίσαι to speed in prosperous course, [Refs]
III.2. right, true, correct, ἄγγελος, ἀγγελία, νόος, [Refs 5th c.BC+]; ὄρθ᾽ ἀκούειν to be rightly, truly called, [Refs 5th c.BC+]strictly speaking, in very truth, [Refs]: so in adverb, ὀρθῶς λέγειν [Refs 5th c.BC+]; ὀ. ἔχει it is right, with infinitive, [Refs 5th c.BC+]: in answers, rightly, exactly, [Refs 5th c.BC+]: superlative, ὀρθότατα καλεόμενος [Refs 5th c.BC+]; φωνεῖν δίκης ἐς ὀρθόν[Refs 5th c.BC+]
III.3. true, real, genuine, ὀ. πολιτεῖαι, opposed to παρεκβάσεις, [Refs 4th c.BC+]; ὀ. μανία real madness, [Refs 3rd c.BC+] adverb -θῶς really, truly, τοὺς ὀ. φιλομαθεῖς [Refs 5th c.BC+]
III.4. upright, just, ἐμμένειν ὀ. νόμῳ [Refs 5th c.BC+]uprightness, [Refs 5th c.BC+]; ἐπιστήμη ἐνοῦσα καὶ ὀ. λόγος (see. λόγος IV. I) [Refs]; ὁ ὀ. λόγος διὰ πάντων ἐρχόμενος (see. λόγος [Refs 3rd c.BC+]; ὀ. λόγοι virtues on the intellectual side, [Refs 1st c.BC+]. adverb ὀρθῶς rightly, justly, [Refs 5th c.BC+]; ὀ. καὶ νομίμως [Refs 5th c.BC+]
III.5. of persons, 'straight', straightforward, σμικροὶ καὶ οὐκ ὀρθοὶ τὰς ψυχάς [Refs 5th c.BC+]
III.6. on tiptoe, full of expectation, excited, ὀρθῆς τῆς πόλεως γενομένης διά τι [Refs 5th c.BC+]
IV. ἡ ὀρθή,
IV.1. (i.e. ὁδός) see above [Refs]
IV.2. ὀ. γωνία right angle, [Refs 5th c.BC+]; so ὀ. alone, [Refs 4th c.BC+] to cut at right angles, [Refs 3rd c.BC+]; εἴ τις δείξειεν ὅτι αἱ ὀρθαὶ οὐ συμπίπτουσι.. that right angles do not meet (short for 'that two straight lines making, with a third, interior angles equal to two right angles, etc.'), [Refs 4th c.BC+]; τὸ δυσὶν ὀρθαῖς the theorem that the angles of a triangle are together equal to two right angles, [Refs]; ὀρθὸς κῶνος, κύλινδρος, a right cone, cylinder, [Refs 3rd c.BC+]
IV.3. (with or without πτῶσις) nominative, Latin casus rectus, opposed to the oblique cases, [Refs 2nd c.BC+]
V. ὀρθά active verbs, opposed to ὕπτια (passive) and οὐδέτερα (neuter), [Refs 3rd c.BC+]
VI. ὀ. τόνος real or unmodified (compare above [Refs 2nd c.AD+]