Source : Webster's Revised Unabridged Dictionary (1913)

Pullulate \Pul"lu*late\, v. i. [L. pullulatus, p. p. of
   pullulare to sprout, from pullulus a young animal, a sprout,
   dim. of pullus. See {pullet}.]
   To germinate; to bud; to multiply abundantly. --Warburton.

Source : WordNet®

pullulate
     v 1: be teeming, be abuzz; "The garden was swarming with bees";
          "The plaza is teeming with undercover policemen"; "her
          mind pullulated with worries" [syn: {teem}, {swarm}]
     2: move in large numbers; "people were pouring out of the
        theater"; "beggars pullulated in the plaza" [syn: {pour},
        {swarm}, {stream}, {teem}]
     3: produce buds, branches, or germinate; "the potatoes
        sprouted" [syn: {shoot}, {spud}, {germinate}, {bourgeon},
        {burgeon forth}, {sprout}]
     4: become abundant; increase rapidly
     5: breed freely and abundantly