Source : Webster's Revised Unabridged Dictionary (1913)

Clabber \Clab"ber\, n. [See {Bonnyclabber}]
   Milk curdled so as to become thick.

Clabber \Clab"ber\, v. i.
   To become clabber; to lopper.

Source : WordNet®

clabber
     n : raw milk that has soured and thickened
     v : turn into curds; "curdled milk" [syn: {curdle}, {clot}]
         [ant: {homogenize}, {homogenize}, {homogenize}]