Mavis is an old-fashioned or literary name for the song thrush, a European bird known for its melodious singing.
The word survives mainly as a woman's given name, occasionally encountered in older literature: The mavis sang at dusk.
1. songbird — thrush, Spotted woodland vocalist; blackbird (Dark-plumaged thrush species); songster (One who vocalizes melodies); warbler (Small melodious bird); nightingale · robin · redwing · ouzel · hedgerow · garden · dawn chorus · birdsong · nesting · speckled
2. name — Mabel, Traditional feminine name; Edna (Female name, Old English); Myrtle (Feminine name from botany); Gladys (Traditional feminine name); Doris · Ethel · Hilda · Beryl · Enid · Elsie · Mildred · Winifred · Blanche · Agnes