The Collaborative International Dictionary of English v.0.48:

Arcuate \Arc"u*ate\, Arcuated \Arc"u*a`ted\(#), a. [L. arcuatus,
   p. p. of arcuare to shape like a bow, fr. arcus. See Arc.]
   Bent or curved in the form of a bow. "Arcuate stalks."
   --Gray.
   [1913 Webster]

WordNet (r) 3.0 (2006):

arcuate
    adj 1: forming or resembling an arch; "an arched ceiling" [syn:
           arced, arched, arching, arciform, arcuate,
           bowed]