It’s either a large leather suitcase with two compartments, or a combination of two words to form one new word. What is it?
Of course, if you read the title, you’ll surmise that it’s portmanteau.
What you’re reading here is a portmanteau–a combination of Web and log, or blog.
Other notable examples are smog (smoke and fog), motel (motor and hotel) and brunch (breakfast and lunch).
Collectively, these are all portmanteaux.