The Collaborative International Dictionary of English v.0.48:
Arvicola \Arvicola\ n. a genus of mice in some classifications considered synonymous with Microtus. Syn: genus Arvicola. [WordNet 1.5]WordNet (r) 3.0 (2006):
Arvicola n 1: in some classifications considered synonymous with Microtus [syn: Arvicola, genus Arvicola]