The Collaborative International Dictionary of English v.0.48:
Heimdal \Heimdal\ n. god of dawn and light; guardian of Asgard. Syn: Heimdall, Heimdallr. [WordNet 1.5]WordNet (r) 3.0 (2006):
Heimdal n 1: (Norse mythology) god of dawn and light; guardian of Asgard [syn: Heimdall, Heimdal, Heimdallr]