Source : Webster's Revised Unabridged Dictionary (1913)

Participial \Par`ti*cip"i*al\, a. [L. participialis: cf. E.
   participal. See {Participle}.]
   Having, or partaking of, the nature and use of a participle;
   formed from a participle; as, a participial noun. --Lowth.

Participial \Par`ti*cip"i*al\, n.
   A participial word.

Source : WordNet®

participial
     adj : of or relating to or consisting of participles; "participial
           inflections"
     n : a non-finite form of the verb; in English it is used
         adjectivally and to form compound tenses [syn: {participle}]