Source : Webster's Revised Unabridged Dictionary (1913)

Springtide \Spring"tide\, n.
   The time of spring; springtime. --Thomson.

Source : WordNet®

springtide
     n 1: a swelling rush of anything; "he rose on the springtide of
          prosperity"
     2: a greater than average tide occurring during the new and
        full moons [ant: {neap tide}]