concavely,adv.|ˈkɒnkeɪvlɪ| [f. concave a. + -ly2.] With a concave outline or surface. 1880Watson in Jrnl.Linn.Soc.Zool. XV. 91 Spire high and sharp-pointed, its concavely conical slope being slightly broken at the sutures.1882Vines Sachs' Bot. 833 They curve concavely towards the source of light.