Perseus analyses of περίσχεο:

περιέχω (encompass, embrace, surround): aor imperat mid 2nd sg (epic doric ionic aeolic)
περιέχω (encompass, embrace, surround): aor ind mid 2nd sg (epic doric ionic aeolic)

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περιέχω

περιέχω, also περι-ίσχω, Th. 5.71; Aeol. περρέχω Sapph. Supp. 25.9, Theoc. 30.3: fut. περιέξω (and περισχήσω Th. 5.7): aor. περιέσχον, inf. περισχεῖν: aor. Med. περιεσχόμην, inf. περισχέσθαι :—

b. esp. of that which encompasses the earth or the universe, τὸν κόσμον πνεῦμα καὶ ἀὴρ π. Anaxim.2; ὁ περὶ χθόνʼ ἔχων αἰθήρ E. Fr. 919 (s.v.l.), cf. Thphr. CP 3.17.4; τὸ περιέχον πάντα ὁπόσα νοητὰ ζῷα Pl. Ti. 31a, cf. 33b; τὸ περιέχον the environment, Epicur. Nat. 79 G.,al., Plot. 2.3.14; τὸ περιέχον ἡμᾶς ἅπαντας καὶ γῆν καὶ θάλατταν, ὃ καλοῦμεν οὐρανόν Str. 16.2.35; ὁ περιέχων ἀήρ ἠήρ) Hp. Lex 3, Arist. Mete. 379a28, D.H. 3.47, Plu. 2.333f, etc.; ὁ περιέχων alone, Id. Cor. 38; but usu. τὸ περιέχον, Anaxag. 2, Arist. Juv. 468a3, Ptol. Phas.p.10 H., S.E. M. 8.286; τὸ ἄπειρον καὶ τὸ π. Arist. GC 332a25, cf. Ph. 253a13, 259b11; φαμὲν τὸ μὲν π. τοῦ εἴδους εἶναι, τὸ δὲ περιεχόμενον τῆς ὕλης Id. Cael. 312a12, cf. Ph. 211b12.

c. τὸ π. the atmosphere, Plb. 1.37.9, D.S. 4.38, etc.; δυσκρασίαι τοῦ π. Plu. Alex. 58.

2. embrace, τινὰ ταῖς χερσίν Id Ant. 79, cf. Alex. 51, Philostr. VS 2.5.3; πατρὸς περὶ ἔχοντος Simon. 115.1.

5. Math., ὁ ὑπὸ δύο ἀριθμῶν περιεχόμενος [ἀριθμός] the product of two numbers, Euc. 7 Def. 19; but π. ἑαυτόν, of a number of which a higher power terminates in the same digit, Theol.Ar. 33.

6. τὸν ἔλεγχον π. to be involved in, open to criticism, Phld. Rh. 1.49 S.

II. surpass, excel, πάντα περρέχοισʼ ἄστρα, of the moon, Sapph. Supp. 25.9; overcome, gain the victory or advantage, Th. 5.7,8.105.

2. outflank the enemy, Id. 5.71; περιέσχον τῷ κέρᾳ οἱ Πελοποννήσιοι Id. 3.108 ,cf.5.73.

III. Med., hold oneʼs hands round or over another: hence, protect, defend, c. gen. pers., περίσχεο (Ion. imper. aor. 2 Med.) παιδὸς ἐῆος Il. 1.393 : c. acc., οὕνεκά μιν περισχόμεθα Od. 9.199.

3. rarely c. inf., περιείχετο . . μένοντας μὴ ἐκλιπεῖν τὴν τάξιν clung to his resolution that they should stay and not leave their post, Hdt. 9.57.

IV. Aeol. περρέχω, = ὑπερέχω, ὁπόσον τῷ ποδὶ περρέχει τᾶς γᾶς, τοῦτο χάρις, i.e. every inch of his stature is grace, Theoc. 30.3.