Lewis & Short

sŭperfĭcĭārĭus, a, um, adj. [superficies], situated on another man’s land, superficiary (jurid. Lat.).

  1. I. Adj.: praedia, Dig. 10, 2, 10: aedes, ib. 43, 18, 2: mathematice, ut ita dicam, superficiaria est: in alieno aedificat, Sen. Ep. 88, 28.
  2. II. Subst.: sŭper-fĭcĭārĭus, ii, m., one who has a house on another man’s land, a superficiary, Dig. 6, 1, 74; 39, 2, 18; 43, 17, 3 med. al.