† diopticadj.n.
Obsolete.
A. adj.
= dioptric adj.
ΘΚΠ
the world > physical sensation > sight and vision > optical instruments > instruments to refract, etc., light > [adjective] > refractor
dioptral1610
dioptric1653
dioptic1656
dioptrical1664
refracting1747
dioptical1818
1656 T. Blount Glossographia The Dioptick Art, the Perspective Art, or that part of Astronomy, which by Quadrants and hollow instruments pierces the Heavens, and measures the distance, length, bigness, and breadth of the Cœlestial bodies.
B. n.
a. One skilled in dioptrics n. at dioptric n. 3.
ΘΚΠ
the world > physical sensation > sight and vision > one skilled in optics > [noun] > in the refraction of light
dioptic1664
dioptrician1671
1664 H. Power Exper. Philos. i. 58 If our Diopticks could attain to that curiosity as to grind us such Glasses, as would present the Effluviums of the Magnet.
b. (plural) = dioptrics n. at dioptric n. 3.
ΘΚΠ
the world > matter > physics > electromagnetic radiation > light > refraction > [noun] > study of
dioptrics1644
dioptic1665
catadioptrics1755
geometrical optics1835
1665 Philos. Trans. (Royal Soc.) 1 56 He intends to give the..demonstration in his Diopticks which he is now writing.
Derivatives
diˈoptical adj.
ΘΚΠ
the world > physical sensation > sight and vision > optical instruments > instruments to refract, etc., light > [adjective] > refractor
dioptral1610
dioptric1653
dioptic1656
dioptrical1664
refracting1747
dioptical1818
1818 H. J. Todd Johnson's Dict. Eng. Lang. Dioptical, and Dioptick, so the next words [dioptrical, dioptric] are now sometimes written.
This entry has not yet been fully updated (first published 1896; most recently modified version published online June 2019).
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adj.n.1656