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dioptral
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The answer DIOPTRAL has 0 possible clue(s) in existing crosswords.
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The word DIOPTRAL is VALID in some board games. Check DIOPTRAL in word games in Scrabble, Words With Friends, see scores, anagrams etc.
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Definitions of dioptral in various dictionaries:
adj - a measure of refractive power [n -S] : DIOPTRAL
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Dioptral might refer to |
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A Dioptra (sometimes also named dioptre or diopter from Greek: διόπτρα) is a classical astronomical and surveying instrument, dating from the 3rd century BCE. The dioptra was a sighting tube or, alternatively, a rod with a sight at both ends, attached to a stand. If fitted with protractors, it could be used to measure angles. |