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plano-spherical
plano-spherical adj. 
/ˌpleɪnoʊˈsfɛrək(ə)l/ planoconvex, with the convex side having spherical curvature.
Brit. /ˌpleɪnə(ʊ)ˈsfɛrᵻkl/
, /ˌpleɪnə(ʊ)ˈsfɛrᵻkl/U.S. /ˌpleɪnoʊˈsfɪrək(ə)l/
, /ˌpleɪnoʊˈsfɪrək(ə)l//ˌpleɪnoʊˈsfɛrək(ə)l/ΚΠ
1757 T. Birch Hist. Royal Soc. IV. 101 Mr Hooke shewed..a very expeditious way of finding all the possible foci of parallel rays refracted by a plano-spherical lens.
1997 Photo Trade News (Nexis) Mar. 24 The ports feature plano-spherical optical glass with O-rings seals.
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