from L. infra (adv., prep.) "below, underneath, beneath," from PIE *ndher (cf. Skt. adnah "below," O.E. under "under, among;" see under). Opposed to super-. Its use as a prefix was rare in Latin.
Main Entry: in·fra Pronunciation: 'in-fr&, -"frä Function: adverb : in the following text :BELOWinfra —D. Q. Posin> —used in books, articles, and cases to refer the reader to later pages, sections, or footnotes of the text —compare IDEM, SUPRA