What is Fugitive Slave?

Legal Definition
One who has escaped from the service of his master.

2. The Constitution of the United States, art. 4, s. 2, 3, directs that "no person held to service or labor in one state, under the laws thereof, escaping into another, shall, in consequence of any laws or regulation therein, be discharged from such service or labor, but shall be delivered up, on claim of the party to whom such service or labor may be clue." In practice summary ministerial proceedings are adopted, and not the ordinary course of judicial investigations, to ascertain whether the claim of ownership be established beyond all legal controversy. Vide, generally, 3 Story, Com. on Const. §1804-1806; Serg. on Const. ch. 31, p. 387; 9 John. R. 62; 5 Serg. & Rawle, 62; 2 Pick. R. 11; 2 Serg. & Rawle, 306; 3 Id. 4; 1 Wash. C. C. R. 500; 14 Wend. R. 507, 539; 18 Wend. R. 678; 22 Amer. Jur. 344.
-- Bouviers Law Dictionary
Legal Definition
One who, held in bondage, flees from his master's power.
-- Black's Law Dictionary
Legal Definition
A slave who has fled from his master.
-- Ballentine's Law Dictionary