ἅπτομαι

1 aorist participle ἅψας; (cf. Latinapto, German heften); (from Homer down);
1. properly, to fasten to, make adhere to; hence, specifically to fasten fire to a thing, to kindle, set on fire, (often so in Attic): λύχνον, Lk 8:16; Lk 11:33; Lk 15:8 (Aristophanes nub. 57; Theophrastus, char. 20 (18); Josephus, Antiquities 4, 3, 4); πῦρ, Lk 22:55 (T Tr text WH περιαψάντων); πυράν, Acts 28:2 L T Tr WH.
2. Middle (present ά῾πτομαι); imperfect ἡπτομην (Mk 6:56 R G Tr marginal reading); 1 aorist ἡψάμην; in the Sept. generally for נָגַע, הִגִּיעַ; properly, to fasten oneself to, adhere to, cling to (Homer, Iliad 8. 67);
a. to touch, followed by the object in genitive (Winers Grammar, § 30, 8 c.; Buttmann, 167 (146); cf. Donaldson, p. 483): Mt 8:3; Mk 3:10; Mk 7:33; Mk 8:22, etc.; Lk 18:15; Lk 22:51 — very often in Matthew, Mark, and Luke. In Jn 20:17, μή μου ἅπτου is to be explained thus: Do not handle me to see whether I am still clothed with a body; there is no need of such an examination, for not yet etc.; cf. Baumg.-Crusius and Meyer at the passage (as given by Hackett in Bib. Sacr. for 1868, p. 779f, or B. D. American edition, p. 1813f).
b. γυναικός, of carnal intercourse with a woman, or cohabitation, 1 Cor 7:1, like the Latintangere, Horace sat. 1, 2, 54: Terence, Heaut. 4, 4, 15, and the Hebrew נָגַע, Gen 20:6; Prov 6:29 (Plato, de legg. viii. 840 a.; Plutarch, Alex. Magn c. 21).
c. with allusion to the levitical precept ἀκαθάρτου μή ἅπτεσθε, have no contact with the Gentiles, no fellowship in their heathenish practices, 2 Cor 6:17 (from Isa 52:11); and in the Jewish sense, μή ἅψῃ, Col 2:21 (the things not to be touched appear to be both women and certain kinds of food, so that, celibacy and abstinence from various kinds of food and drink are recommended; cf. DeWette at the passage (but also Meyer and Lightfoot; on the distinction between the stronger term ἅπτεσθαι (to handle?) and the more delicate θιγεῖν (to touch?) cf. the two commentators just named and Trench, § xvii. In classic Greek also ἅπτεσθαι is the stronger term, denoting often to lay hold of, hold fast, appropriate; in its carnal reference differing from θιγγάνειν by suggesting unlawfulness. θιγγάνειν, is used of touching by the hand as a means of knowledge, handling for a purpose; ψηλαφαν signifies to feel around with the fingers or hands, especially in searching for something, often to grope, fumble, cf. ψηλαφινδα blindman's buff. Schmidt, chapter 10.)).
d. to touch i. e. assail: τίνος, anyone, 1 Jn 5:18 (1 Chr 16:22, etc.). (Compare: ἀνάπτω, καθάπτω, περιάπτω.)