From The Collaborative International Dictionary of English v.0.48 :
palaeontology \palaeontology\ n.
The branch of archeology that studies fossil organisms and
related remains.
Syn: paleontology, fossilology.
[WordNet 1.5]
From WordNet (r) 3.0 (2006) :
palaeontology
n 1: the earth science that studies fossil organisms and related
remains [syn: paleontology, palaeontology,
fossilology]