reremouse - Wiktionary, the free dictionary

From Wiktionary, the free dictionary

• rearmouse, reermouse

From Middle English reremous, from Old English hrēremūs, hrœ̄remūs (“bat”). By surface analysis, rear (“to move, shake, stir”) +‎ mouse.

reremouse (plural reremice)

1. (rare, archaic, poetic or heraldry) A bat (flying mammal).

   • 1923, Notes and Queries, page 299:

     Argent, a reremouse sable, […]

• reermouse