
1) Ancient Greek priestess 2) Classical oracle 3) Greek deity 4) Greek girl name 5) Priestess of Apollo at Delphi 6) Pythoness 
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https://www.crosswordclues.com/clue/pythia

1) Oracle 
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https://www.crosswordclues.com/clue/pythia

 PYTHIA is a computer simulation program for particle collisions at very high energies (see event (particle physics)) in particle accelerators. ==History== PYTHIA was originally written in FORTRAN 77, until the release of PYTHIA 8.1 which was rewritten in C++. Both the Fortran and C++ versions are being maintained because not all components were me...
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http://en.wikipedia.org/wiki/PYTHIA

 The Pythia (@ or @, Πυθία pyːˈtʰi.a), commonly known as the Oracle of Delphi, was the name of any priestess throughout the history of Temple of Apollo at Delphi, located on the slopes of Mount Parnassus, beneath the Castalian Spring (the new priestess was selected after the death of the current priestess). The Pythia was widely credited fo...
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http://en.wikipedia.org/wiki/Pythia
 [gastropod]
[gastropod]  clade Euthyneura clade Panpulmonata Pythia is a genus of small air-breathing salt marsh snails, pulmonate gastropod mollusks in the family Ellobiidae. Pythia is a largely terrestrial genus commonly found in the Indo-Pacific. It lives in mangroves from above high tide to further inland. It is readily differentiated within the fam...
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http://en.wikipedia.org/wiki/Pythia_(gastropod)

(from the article `oracle`) ...the Corinthian Gulf. Traditionally, the oracle first belonged to Mother Earth (Gaea) but later was either given to or stolen by Apollo. At Delphi ...
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http://www.britannica.com/eb/a-z/p/138

Priestess of the god Apollo at the 
oracle of Delphi in ancient Greece, and his medium. When consulted, her advice was interpreted by the priests of Apollo and shaped into enigmatic verses. ...
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http://www.encyclo.co.uk/local/20688

[
n] - (Greek mythology) the priestess of Apollo at Delphi who transmitted the oracles
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http://www.webdictionary.co.uk/definition.php?query=Pythia

a woman who served at the Delphic Oracle for life; inspired by the god Apollo, she would prophecy; the Delphic oracles would often be ambiguous and easy to misunderstand.
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https://www.encyclo.co.uk/local/10135
 noun
 noun (Greek mythology) the priestess of Apollo at Delphi who transmitted the oracles
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https://www.encyclo.co.uk/local/20974

the priestess of Apollo at Delphi who delivered the oracles.
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https://www.infoplease.com/dictionary/pythia
  No exact match found.