mouse-ear /ˈmaʊsɪə/ noun3 •A type of small hawkweed native to Eurasia (mouse-ear hawkweed, Pilosella officinarum), commonly found on dry grasslands.Mouse-ear is a low herb creeping upon the ground by small strings like the Strawberry plant, whereby it shoots forth small roots […] — 1653 •A plant of the genus Cerastium (mouse-eared chickweed). •A forget-me-not (genus Myosotis). formsmouse-ears