Definition of "mushrump"

Bozzacchio, an acorne. Also a puffe or mushrump full of dust.

1598, John Florio, “Mushrump”, in A Worlde of Words, or Most Copious, and Exact Dictionarie in Italian and English, […], London: […] Arnold Hatfield for Edw[ard] Blount, page 47

[…] you, whose pastime / Is to make midnight-Mushrumps, that reioyce / To heare the solemne Curfewe […]

1610–1611 (date written), William Shakespeare, “The Tempest”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, [Act V, scene i]

[M]en, if Fame ſay true, / Here at the firſt from ſhower-rayſd muſhrumps grew, […]

1626, Ovid, “The Seuenth Booke”, in George Sandys, transl., Ovid’s Metamorphosis Englished […], London: […] William Stansby, page 136

So shall we haue the people of our side, / Which for his fathers sake leane to the king, / But cannot brooke a night growne mushrump, / Such a one as my Lord of Cornewall is […]

1594, Christopher Marlow[e], The Troublesome Raigne and Lamentable Death of Edward the Second, King of England: […], London: […] [R. Robinson] for William Iones […], (please specify the page)

You Court ſpaniell, you vnneceſſarie muſhrump, that in one night art ſprung out of the roote of greatnes, […]

1605 (date written), Iohn Day, The Ile of Guls. […], London: […] [John Trundle], and are to bee sold by Iohn Hodgets […], published 1606, signature [B4], recto

Oh here is a mushrump Phylosopher! shotte vppe since yesterday:

1610, chapter 29, in John Healey, transl., Epictetus His Manuall‎, London: E. Blunt & W. Barret, page 34

[I]f these Vpstarts and mushrump nobles, were but permitted to bee about the Kings Person in his youth, they would afterwards by that meanes so purchase his favour, that they would become so powerfull, when hee should attaine to maturitie of yeares, that all the Honours, Possessions, and lines of the ancient Nobilitie of this Realme would bee in danger, to bee subject to their wills […]

1636, John Trussel, “The Life and Raigne of King Edward the Fift”, in A Continuation of the Collection of the History of England‎, London: Ephraim Dawson, page 213