Source : Webster's Revised Unabridged Dictionary (1913)

Palpitant \Pal"pi*tant\, a. [L. palpitans, p. pr.]
   Palpitating; throbbing; trembling. --Carlyle.

Source : WordNet®

palpitant
     adj : having a slight and rapid trembling motion; "palpitant
           movements rather than violent eruptions"; "my
           palpitating heart" [syn: {palpitating}]