Definition of "plano-convex" [pla•no-con•vex]

• Flat or plane on one side and rounded on the other, such that the center is thicker than the edges. (adjective)

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• "Galileo's telescope consisted of two lenses -- one plano-convex, the other plano-concave, the latter being held next the eye."
• "In fact, a plano-convex crystal lens has been found among the ruins of"
• "The spikelets are plano-convex, orbicular to oblong, obtuse, secund, 2-ranked on the flattened or triquetrous rachis of the spike-like branches of a raceme, one-flowered and falling off entire from the very short or obscure pedicels."