webisode

/W EH1 B AH0 S OW0 D/
noun
  1. 1

    A short audio or video presentation on an Internet site.

  2. 2

    An episode of an Internet-based movie etc.

  3. 3

    An episode of a television show that is only aired online.

Source: https://en.wiktionary.org/wiki/webisode