Tar·tu 
(tärt)
(tärt) A city of southeast Estonia southeast of Tallinn. Founded in 1030, it was a member of the Hanseatic League and became part of Russia in 1704.
- proto-oncogene
- protopathic
- protopathy
- protoplanet
- protoplanetary disk
- protoplasm
- protoplasmal
- protoplasmatic
- protoplasmic
- protoplast
- protoplastic
- protoporphyrin
- protostar
- protostele
- protostelic
- protostome
- prototroph
- prototrophic
- prototrophy
- prototypal
- prototype
- prototypic
- prototypical
- protozoal
- protozoan