Forensic

google

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mid 17th century: from Latin forensis ‘in open court, public’, from forum (see forum).

wiktionary

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From Latin forēnsis(“of the forum, public”), from forum(“forum, marketplace”).

etymonline

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forensic (adj.)

"pertaining to or suitable for courts of law," 1650s, with -ic + stem of Latin forensis "of a forum, place of assembly," related to forum "public place" (see forum). Later used especially in sense of "pertaining to legal trials," as in forensic medicine (1845). Related: Forensical (1580s).