sillid
Sillid is a term that does not have a widely recognized definition in standard English reference works. It is a rare or obscure form that may appear in some historical or specialized texts, and is more likely to be found as a proper name or as a nonstandard variant spelling rather than a distinct technical term.
In architecture and construction, the fundamental element is the sill—the bottom horizontal member of a window
In geology and petrology, the term sill denotes a tabular intrusion of igneous rock. A supposed usage
As an onomastic occurrence, sillid may appear as a surname or family name in certain communities, but
Etymology for sillid is uncertain. It appears to be a derivative or variant form related to sill,