† omphalopticn.adj.
Optics. Obsolete.
A. n.
= omphalopter n. rare.Apparently only attested in dictionaries or glossaries.
ΘΚΠ
the world > physical sensation > sight and vision > optical instruments > lens > [noun] > other lenses
concave1632
globe1653
meniscus1693
hemispherule1696
convex1705
omphaloptic1728
omphalopter1738
crown lens1764
achromatic1785
condenser1798
meniscus lens1820
Fresnel lens1835
bull's-eye1839
Stanhope lens1850
spot lens1860
amplifier1866
achromat1873
projectora1884
aplanat1890
triplet condenser1892
Aldis lens1902
monocentric1922
Schmidt correcting plate1934
coated lens1948
Panavision1955
Schmidt correcting lens1961
re-imaging1962
1728 E. Chambers Cycl. Omphaloptic, in Optics, a Glass that is convex on both sides, popularly call'd a Convex-Lens.
B. adj.
Of a lens: biconvex. rare.
ΘΚΠ
the world > physical sensation > sight and vision > optical instruments > lens > [adjective] > types of lenses
convex?a1560
planoconvex1665
concavo-convex1677
convexo-concave1693
strong1732
aplanatic1799
periscopic1803
omphaloptic1819
polyzonal1823
shallow1837
first-order1846
periscopical1846
orthoscopic1853
rectilinear1874
overcorrected1875
sphero-cylindrical1881
wide-aperture1882
afocal1887
apochromatic1887
anastigmatic1890
telecentric1892
photovisual1899
aspherical1922
aspheric1923
multifocal1928
plano1944
demagnifying1959
1819 H. Busk Dessert 457 The omphaloptic stud.
This entry has been updated (OED Third Edition, March 2004; most recently modified version published online June 2021).
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n.adj.1728