The term SPAM MEDIUM is a combination of two words, the first being 'spam' and the second being 'MEDIUM'. Spam is an unsolicited email sent in bulk to a large number of recipients, often containing advertisements or malicious content. The MEDIUM refers to the method of communication used to send the spam, which is usually email. Therefore, the crossword solution for SPAM MEDIUM is EMAIL, as this is the most common way for spammers to send their messages.