harvest mouse is a noun meaning "any of several small greyish New World mice inhabiting e.g. grain fields". It carries 2 recorded senses.
any of several small greyish New World mice inhabiting e.g. grain fields
small reddish-brown Eurasian mouse inhabiting e.g. cornfields
Definitions, synonyms and semantic relations for harvest mouse come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.