adv. [f. VERTICAL a. + -LY2.] In a vertical manner, direction or position; so as to be vertical to the plane of the horizon, the earth’s surface, or some other horizontal line or plane; perpendicularly, or approximately so; directly overhead or down below.
1646. Sir T. Browne, Pseud. Ep., VI. x. 326. The Dogstarre,… although it be not verticall unto any part of Asia,… yet is it so unto America, and vertically passeth over the habitations of Peru and Brasilia.
1677. Grew, Anat. Fruits, v. § 17. The Seed-Case of Anagallis … opens not by its Meridian or Vertically,… but by its Horizon.
1679. Moxon, Math. Dict., s.v. Vertex, A Star is said to be Vertical, that … Vertically hangs over any place.
1686. Plot, Staffordsh., 17. If Lightening causes these Circles, it must also be allowed that it descends vertically.
1794. G. Adams, Nat. & Exp. Philos., II. xvii. 261, note. The pupil in animals of the cat kind … is oblong vertically.
1796. Withering, Brit. Plants (ed. 3), III. 763. Capsules opening vertically.
1828. Stark, Elem. Nat. Hist., II. 221. Some [insects], as the butterflies, raise their wings vertically in repose.
1842. Loudon, Suburban Hort., 615. Some modification of lateral training will, in almost every case, be found preferable to training vertically.
1880. Haughton, Phys. Geog., ii. 21. An earthquake occurred, vertically under the town of Arica.
Comb. 1793. Martyn, Lang. Bot., s.v. Verticale, A vertically ovate leaf is the same with an obversely-ovate or obovate leaf; and a vertically cordate leaf is the same with an obversely cordate or obcordate leaf.
1878. Abney, Treat. Photogr., xxxiii. 268. A fair general focus can … be obtained by using with the camera a vertically-pivoted swing-back.
b. Math. (Cf. VERTICAL a. 2).
1660. Barrow, Euclid, I. xv. Schol., If four right lines, proceeding from one point, make the angles vertically opposite equal.
1840. Lardner, Geom., 24. When two straight lines cross each other,… the angle BAD is said to be verticaily opposite to the angle EAC.
