An archaic or variant spelling of coulisse, a grooved timber or flexible device used in theater or architecture.
From French 'coulisse' (a sliding or grooved device), derived from 'couler' meaning 'to flow' or 'to slide'; English adopted this theatrical term with spelling variations.
Theater history lives in this word—'cullis' is the backstage machinery that made scene changes possible in Renaissance theaters, hidden from audiences.
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