Definition of pytheas:
(N) :
Pytheas of Massalia (Ancient Greek: Πυθέας ὁ Μασσαλιώτης Pythéās ho Massaliōtēs; Latin: Pytheas Massiliensis; born 350 BC, 320–306 BC) was a Greek geographer, explorer and astronomer from the Greek colony of Massalia (modern-day Marseille, France).
(N) :
a small lunar impact crater located on the southern part of the Mare Imbrium, to the south of the crater Lambert.
(N) :
Pytheas of Athens was an orator who wrote speeches and other works.