different between speculum vs diopter

English

Etymology

From Latin speculum (“mirror”), from specere (“to see; to look at”) + -ulum (“forming tools of performing a verb”).

Pronunciation

• (UK) IPA^(key): /?sp?kj?l?m/
• (UK) enPR: sp?k?y?-l?m, IPA^(key): /?sp?kj?l?m/

Noun

speculum (plural speculums or specula)

1. (medicine) A medical instrument used during an examination to dilate an orifice.
3. A mirror, especially one used in a telescope.
4. (ornithology) A bright, lustrous patch of colour found on the wings of ducks and some other birds, usually situated on the distal portions of the secondary quills, and much more brilliant in the adult male than in the female.
5. A lookout place.

Translations

Anagrams

• muscle up, muscle-up

Latin

Alternative forms

• speclum (Vulgar or Late Latin, Appendix Probi)

Etymology

From speci? +? -culum. Confer with spectrum.

Pronunciation

• (Classical) IPA^(key): /?spe.ku.lum/, [?s?p?k??????]
• (Ecclesiastical) IPA^(key): /?spe.ku.lum/, [?sp??kulum]

Noun

speculum n (genitive specul?); second declension

1. a looking-glass, mirror

Declension

Second-declension noun (neuter).

Related terms

• speculor

Descendants

References

• speculum in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• speculum in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• speculum in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition, 1883–1887)
• speculum in Gaffiot, Félix (1934) Dictionnaire illustré Latin-Français, Hachette
• speculum in Harry Thurston Peck, editor (1898) Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
• speculum in William Smith et al., editor (1890) A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin

English

Alternative forms

• dioptra
• dioptre
• dioptry (obsolete)

Etymology

From Latin dioptra, from Ancient Greek ??????? (dióptra).(Can this⁽⁺⁾ etymology be sourced?)

Noun

diopter (plural diopters)

1. A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters. Myopia is diagnosed and measured in diopters.
2. The dioptre adjustment mechanism of a pair of binoculars or of a camera viewfinder.
3. (photography, dated) A lens element attached to the front of a photographic lens to shorten the lens's minimum focus distance; also called a "close-up filter".
4. (obsolete) Any lens system, such as a telescope.
5. (obsolete) A theodolite or similar surveyor’s angle measuring device.
6. (obsolete) An alidade.
7. (obsolete) A surgical speculum.
8. (obsolete) An instrument for drawing the skull by projections.

Translations

References

Anagrams

• dioptre, peridot, periodt, proetid, proteid, protide, pterido-, pteroid, reptoid