An Etymological Dictionary of Astronomy and Astrophysics

A person who directs a project, a group, a production.

Etymology (EN): From → direct + -tor a suffix found in loanwords from L., forming personal agent nouns from verbs.

Etymology (PE): Râštâr, from râšt- stem of râštidan→ direct + -âr suffix of agent noun (as in parastâr “nurse”).