The term 'prefix with -valent' refers to a prefix that is added to the beginning of a word to indicate the number of parts or components it has. The four crossword solutions for this term are AMBI (4 letters), OCTA (4 letters), TRI (3 letters), and EQUI (4 letters). AMBI-valent means having two parts or components, OCTA-valent means having eight parts or components, TRI-valent means having three parts or components, and EQUI-valent means having four parts or components.