Full Idea
An object is 'gunky' if each of its parts has further proper parts; thus gunk involves infinite descent in the part-whole relation.
Gist of Idea
'Gunk' is an object in which proper parts all endlessly have further proper parts
Source
Theodore Sider (Writing the Book of the World [2011], 07.11.2)
Book Reference
Sider,Theodore: 'Writing the Book of the World' [OUP 2011], p.133