The Collaborative International Dictionary of English v.0.48:

Stuprum \Stu"prum\, n. [L.]
   Stupration.
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

STUPRUM, civ. law. The criminal sexual intercourse which took place between
a man and a single woman, maid or widow, who before lived honestly. Inst. 4,
18, 4; Dig. 48, 5, 6; Id. 50, 16, 101; 1 Bouv. Inst. Theolo. ps. 3, quaest.
2, art. 2, p. 252.