† prognostesn.

Etymology: < Byzantine Greek προγνώστης skilled in prognosis < ancient Greek προ- pro- prefix² + Hellenistic Greek γνώστης person who knows < the stem of ancient Greek γιγνώσκειν to know (see know v.) + -της, suffix forming agent nouns. Compare post-classical Latin prognosta (a1536 in Erasmus).The -σ- in γνώστης is unetymological, although the form may be modelled on other agent nouns in -στης.