Source : Webster's Revised Unabridged Dictionary (1913)

Pectic \Pec"tic\, a. [Gr. ? curdled.] (Chem.)
   Of or pertaining to pectin; specifically, designating an acid
   obtained from ordinary vegetable jelly (pectin) as an
   amorphous substance, tough and horny when dry, but gelatinous
   when moist.

Source : WordNet®

pectic
     adj : of or relating to or derived from pectin; "pectic acid"