Word Study
unicursal
CIDE DICTIONARY
unicursal, a. [Uni- + L. currere, cursum, to run.].
That can be passed over in a single course; -- said of a curve when the coördinates of the point on the curve can be expressed as rational algebraic functions of a single parameter 1913 Webster]
" As unicursal ." [1913 Webster]
For further exploring for "unicursal" in Webster Dictionary Online