ˈinfəŋˌthēf noun
Etymology: Middle English infangenthef, infangthef, from Old English infangenethēof, infangenthēof, from in, inn in + fangen (past participle of fōn to seize, capture) + thēof thief — more at in , pact , thief
: a medieval franchise of exercising jurisdiction over a thief caught within the limits to which the franchise was attached : the right of the lord of a manor to judge a thief taken within the seigniory of such lord — distinguished from outfangthief