Entry 1 sense Webster, 1913

Lady's thumb

/(lā"dĭz thŭm")/ · La·dy's thumb · IPA

01 n. An annual weed (Polygonum Persicaria), having a lanceolate leaf with a dark spot in the middle.

1.
An annual weed (Polygonum Persicaria), having a lanceolate leaf with a dark spot in the middle.(Bot.)