† omphaloptern.

Origin: A borrowing from Greek, combined with an English element. Etymons: omphalo- comb. form, Greek ὀπτήρ.

Etymology: < omphalo- comb. form + ancient Greek ὀπτήρ one who looks (see horopter n.). Compare omphaloptic n.

Optics. Obsolete. rare. Apparently only attested in dictionaries or glossaries.

A biconvex lens.

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

1738 E. Chambers Cycl. (ed. 2) Omphalopter, or Omphaloptic, in optics, a glass that is convex on both sides, popularly call'd a convex-lens.

This entry has been updated (OED Third Edition, March 2004; most recently modified version published online June 2021).

单词	omphalopter
释义	† omphaloptern. Origin: A borrowing from Greek, combined with an English element. Etymons: omphalo- comb. form, Greek ὀπτήρ. Etymology: < omphalo- comb. form + ancient Greek ὀπτήρ one who looks (see horopter n.). Compare omphaloptic n. Optics. Obsolete. rare. Apparently only attested in dictionaries or glossaries. A biconvex lens. 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 1738 E. Chambers Cycl. (ed. 2) Omphalopter, or Omphaloptic, in optics, a glass that is convex on both sides, popularly call'd a convex-lens. This entry has been updated (OED Third Edition, March 2004; most recently modified version published online June 2021). < n.1738
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