portmanteau

Concise Oxford English Dictionary © 2008 Oxford University Press:
portmanteau /pɔːtˈmantəʊ/

▶noun (pl. portmanteaus or portmanteaux /-əʊz/)

• 1 a large travelling bag made of stiff leather and opening into two equal parts.

• 2 [as modifier] consisting of two or more parts, aspects, or qualities: a portmanteau movie.

– origin C16: from Fr. portemanteau, from porter ‘carry’ + manteau ‘mantle’.