The word is in the Wiktionary

9 short excerpts of Wiktionnary (A collaborative project to produce a free-content dictionary.)

— English words —

• diopter n. A unit of measure of the power of a lens or mirror, equal to the reciprocal of its focal length in meters…
• diopter n. The dioptre adjustment mechanism of a pair of binoculars or of a camera viewfinder.
• diopter n. (Photography, dated) A lens element attached to the front of a photographic lens to shorten the lens’s…
• diopter n. (Obsolete) Any lens system, such as a telescope.
• diopter n. (Obsolete) A theodolite or similar surveyor’s angle measuring device.
• diopter n. (Obsolete) An alidade.
• diopter n. (Obsolete) A surgical speculum.
• diopter n. (Obsolete) An instrument for drawing the skull by projections.

— English word, defined in French —

• diopter n. Dioptrie.

51 English words from 8 English definitions

adjustment alidade angle Any attached binoculars camera dated device dioptre drawing element equal focal focal␣length for front instrument its length lens measure measuring mechanism meters mirror Obsolete of␣a pair pair␣of␣binoculars photographic Photography power projections reciprocal shorten similar skull speculum such such␣as surgical surveyor system telescope the theodolite to␣the unit unit␣of␣measure viewfinder

1 foreign word from the foreign definition

Dioptrie

3 suffixes (New words found by adding one or more letters at the end of the word.)

diopters diopteric␣aberration diopteric␣aberrations

15 words-in-word (Words found as is inside the word. Minimum size 3 letters.)

DIO Diop IOP opt oPt OPt OPT opt. opter Pte PTE -pter ter TER ter-

10 words-in-word RTL (Words found written from right to left, inside the word. Minimum size 3 letters.)

ETP OID -oid poi POI P.O.I. poid ret Ret. TPO

9 anagrams (New words found by changing the order of the letters.)

dioptre peridot periodt proetid proteid protide pterido- pteroid reptoid

45 anagrams found with an extra letter (New words formed with all the letters from the word and an extra letter.)

depictor diopters dioptres Dipietro DiPietro Di␣Pietro diporate dipteroi dipteros dropsite imported itopride peridote peridots piedfort pirooted portside poteriid pot␣hider preditor proetids profited proteide proteids protelid proteoid protides proudite pterioid pteroids pteropid redpoint red␣point reptoids ridgetop riposted tapidero tephroid tiptrode topsider tridoped tripcode tripoded tripodes trophied

32 anagrams found minus a letter (New words formed with all the letters from the word minus a letter.)

deport de␣trop doiter dopier dorpie dotier editor Epirot period periot podite -poride porite ported Potier Prieto protei pterid- redipt redtop red-top red␣top rioted Tidore tierod tie␣rod toe-dip torpid trepid triode tripod troped

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