The Collaborative International Dictionary
Infangthef
Infangthef \In*fang"thef\, n. [AS. in-fangen-[thorn]e['o]f; in
in, into + fangen taken (p. p. of f[=o]n to take) +
[thorn]e['o]f thief.] (O. Eng. Law)
The privilege granted to lords of certain manors to judge
thieves taken within the seigniory of such lords.
--Cowell.
Wiktionary
infangthef
n. (alternative form of infangthief English)