<botany> With the petals united by their margins, at least at the base. ... Compare: polypetalous. ... (09 Oct 1997) ... Found on http://www.encyclo.co.uk/local/20973
Gam`o·pet'al·ous adjective [ Greek ... marriage + English petalous : confer French gamopétale .] (Botany) Having the petals united or joined so as to form a tube or cup; monopetalous. Found on http://www.encyclo.co.uk/webster/G/7