Shortening of poesy (“poetry”).
posy (plural posies)
- A flower; a small bouquet; a nosegay. [from 1570s]
- (archaic) A verse of poetry, especially a motto or an inscription on a ring. [from early 15th c.]
- c. 1599–1602, William Shakespeare, “The Tragedie of Hamlet, Prince of Denmarke”, in Mr. William Shakespeares Comedies, Histories, & Tragedies: Published According to the True Originall Copies (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, OCLC 606515358, [Act III, scene ii], page 267, column 2:
- Is this a Prologue, or the Poeſie of a Ring?