The Collaborative International Dictionary of English v.0.48:
Leger \Leg"er\, a. [F. l['e]ger, fr. LL. (assumed) leviarius, fr. L. levis light in weight. See Levity.] Light; slender; slim; trivial. [Obs. except in special phrases.] --Bacon. [1913 Webster] Leger line (Mus.), a line added above or below the staff to extend its compass; -- called also added line. [1913 Webster]