Source : Webster's Revised Unabridged Dictionary (1913)

Tar \Tar\, v. t. [imp. & p. p. {Tarred}; p. pr. & vb. n.
   {Tarring}.]
   To smear with tar, or as with tar; as, to tar ropes; to tar
   cloth.

   {To tar and feather a person}. See under {Feather}, v. t.

Source : WordNet®

tar
     n 1: any of various dark heavy viscid substances obtained as a
          residue [syn: {pitch}]
     2: a man who serves as a sailor [syn: {mariner}, {seaman}, {Jack-tar},
         {Jack}, {old salt}, {seafarer}, {gob}, {sea dog}]
     [also: {tarring}, {tarred}]

tar
     v : coat with tar; "tar the roof";  "tar the roads"
     [also: {tarring}, {tarred}]

tarring
     See {tar}