planoconcaveadj.n.
/ˌpleɪnəʊˈkɒnkeɪv/, /ˌpleɪnəʊˈkɒŋkeɪv/, U.S. /ˌpleɪnoʊˈkɑnˌkeɪv/ Esp. of a lens: having one surface plane and the opposite one concave. Also occasionally as n.: a planoconcave lens.
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the world > space > shape > curvature > curved surface > [adjective] > concave > plane on one side
planoconcave1654
1654 W. Charleton Physiologia Epicuro-Gassendo-Charltoniana 161 A Concave Lens, whether Plano-concave, or Concave on both sides.., projects the Image of an Object.
1693 Philos. Trans. (Royal Soc.) 17 961 Whether the Lens be..Plano-Convex or Plano-Concave.
1709 W. Molyneux Dioptrica Nova (ed. 2) 78 So C P the Radius of the Plano-Concave Glass.
1764 Philos. Trans. 1763 (Royal Soc.) 53 193 Let MpCNcM (fig. 8) be a double convex lens of water confined between the plano-concave MTLN, and the meniscus MKNcM, both of glass, and having the radii of their surfaces contiguous to the water, equal to each other, or to unity.
1807 W. Herschel in Philos. Trans. (Royal Soc.) 97 183 The plain side of a plano-concave, or plano-convex lens.
1881 J. Le Conte Sight 34 And one with excess of dispersive over refractive power for our plano-concave lens.
1962 L. S. Sasieni Princ. & Pract. Optical Dispensing x. 268 Many modern trial cases are made with plano-convex and plano-concave spheres.
1997 I. Ridpath Dict. Astron. 365 Planoconcave, a lens having one flat face and one concave face; it is a diverging lens.
This entry has been updated (OED Third Edition, June 2006; most recently modified version published online March 2022).
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adj.n.1654