PanLinx: двояковогнутая линза

русский	rus-000
двояковогнутая линза

English	eng-000	biconcave lens
English	eng-000	concave-concave concave lens
English	eng-000	double concave lens
English	eng-000	double-concave lens
English	eng-000	equiconcave lens

PanLex-PanLinx