Definition of phrontistery in English:
 phrontistery
nounPlural phrontisteries ˈfrɒntɪst(ə)ri
archaic A school or other educational institution.
 Example sentencesExamples
-  He calls his servant to bring a pickaxe, and get up on the phrontistery, and knock in the roof about their ears.
 -  I know where I am: in one of the famous Phrontisteries of Law and Justice.
 -  This brings me to a wider discussion about how universities should stop thinking they are money-making training enterprises, and should rather be phrontisteries that encourage creativity and innovation.
 -  To the phrontistery flocked some of the nation's leading young libertarians, including Smith and Gaskins.
 -  England's grand phrontisteries, seminaries and seed-plots of learning: Oxford and Cambridge.
 
 Synonyms
educational institution, centre of learning
Origin
  
Early 17th century: from Greek phrontistērion, from phrontistēs 'deep thinker', from phrontizein 'be thoughtful', from phrontis 'thought'.