Aplanatic
Aplanatic Ap`la*nat"ic, a. [Gr. 'a priv. + ? disposed to wander, wandering, ? to wander.] (Opt.) Having two or more parts of different curvatures, so combined as to remove spherical aberration; -- said of a lens. [1913 Webster]

{Aplanatic focus} of a lens (Opt.), the point or focus from which rays diverging pass the lens without spherical aberration. In certain forms of lenses there are two such foci; and it is by taking advantage of this fact that the best aplanatic object glasses of microscopes are constructed. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • aplanatic — [ap΄lə nat′ik] adj. [< Gr aplanētos, unerring < a , not + planan: see PLANET] Optics corrected for spherical aberration and coma: said of a lens …   English World dictionary

  • aplanatic — adjective Etymology: a + Greek planasthai to wander more at planet Date: 1794 free from or corrected for spherical aberration < an aplanatic lens > …   New Collegiate Dictionary

  • aplanatic — Pertaining to aplanatism, or to an a. lens. * * * ap·la·nat·ic .ap lə nat ik, .ā plə adj free from or corrected for spherical aberration <an aplanatic lens> ap·la·nat·i·cal·ly i k(ə )lē adv …   Medical dictionary

  • aplanatic — aplanatically, adv. /ap leuh nat ik/, adj. Optics. free from spherical aberration and coma. [1785 95; A 6 + Gk planá(ein) to wander + TIC. See PLANET] * * * …   Universalium

  • aplanatic — adjective Free from, or corrected for, spherical aberration and chromatic aberration …   Wiktionary

  • aplanatic — ap·la·nat·ic …   English syllables

  • aplanatic — ap•la•nat•ic [[t]ˌæp ləˈnæt ɪk[/t]] adj. opt (of a lens) free from spherical aberration and coma • Etymology: 1785–95; aplanat (irreg. < Gkaplánētos; see a VI, planet) + ic ap la•nat′i•cal•ly, adv …   From formal English to slang

  • aplanatic — /æpləˈnætɪk/ (say apluh natik) adjective Optics free from spherical aberration and coma. {Greek aplanētos not wandering + ic} –aplanatism, noun …   Australian English dictionary

  • aplanatic — adj. (of a reflecting or refracting surface) free from spherical aberration. Etymology: Gk aplanetos free from error f. a not + planao wander …   Useful english dictionary

  • Aplanatic focus — Aplanatic Ap la*nat ic, a. [Gr. a priv. + ? disposed to wander, wandering, ? to wander.] (Opt.) Having two or more parts of different curvatures, so combined as to remove spherical aberration; said of a lens. [1913 Webster] {Aplanatic focus} of a …   The Collaborative International Dictionary of English

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