
1) Mathematician
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https://www.crosswordclues.com/clue/diophantus

Diophantus of Alexandria (Διόφαντος ὁ Ἀλεξανδρεύς; born sometime between AD 201 and 215; died aged 84 sometime between AD 285 and 299), sometimes called `the father of algebra`, was an Alexandrian Greek mathematician and the author of a series of books called Arithmetica, many of which are now lost. These texts deal with s.....
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http://en.wikipedia.org/wiki/Diophantus
[crater] Diophantus is a lunar impact crater that lies in the southwestern part of the Mare Imbrium. It forms a pair with the larger crater Delisle to the north. Diophantus has a wide inner wall and a low central rise. To the north of Diophantus is the sinuous rille designated Rima Diophantus, named after the crater. There is a tiny craterl...
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http://en.wikipedia.org/wiki/Diophantus_(crater)
[general] Diophantus (Διόφαντος), son of Asclepiodorus, of Sinope, was a general in the service of Mithridates VI of Pontus. Diophantus was active in Mithridates` campaigns in the Bosporan Kingdom and elsewhere around the Black Sea, although their chronology is disputed. An inscription found during the excavations in Chersonesos gl...
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http://en.wikipedia.org/wiki/Diophantus_(general)

[
n] - Greek mathematician who was the first to try to develop an algebraic notation (3rd century)
Found on
http://www.webdictionary.co.uk/definition.php?query=Diophantus
noun Greek mathematician who was the first to try to develop an algebraic notation (3rd century)
Found on
https://www.encyclo.co.uk/local/20974
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