v.intr.
1. (of a seed, shoot, etc.) bud, sprout, germinate.
2 (esp. of an animal) swarm, throng; breed prolifically.
3 develop; spring up; come to life.
4 (foll. by with) abound.
Derivatives:
pullulant adj. pullulation n.
Etymology: L pullulare sprout f. pullulus dimin. of pullus young of an animal