nPurpresture(Law) Wrongful encroachment upon another's property; esp., any encroachment upon, or inclosure of, that which should be common or public, as highways, rivers, harbors, forts, etc.
Century Dictionary and Cyclopedia
npurprestureIn law, a nuisance consisting in an inclosure of or encroachment on something that belongs to another person or to the public, as the shutting up or obstruction of a highway or of navigable waters. Encroachments other than against the public are no longer termed purprestures.
Chambers's Twentieth Century Dictionary
nPurpresturea private encroachment upon a public highway, &c