Definition of ef- in English:

ef-

Pronunciation: /ɪf, ɛf/

prefix

  • variant spelling of ex-1 assimilated before f (as in efface, effloresce).

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space