The Collaborative International Dictionary of English v.0.48:

Curd \Curd\ (k[^u]rd), v. t. [imp. & p. p. Curded; p. pr. &
   vb. n. Curding.]
   To cause to coagulate or thicken; to cause to congeal; to
   curdle.
   [1913 Webster]

         Does it curd thy blood
         To say I am thy mother?                  --Shak.
   [1913 Webster]