Omniverbum

From Tardis Wiki, the free Doctor Who reference

The Omniverbum was the term used for the longest word in existence. It was thought to be infinitely long, and possibly still being spoken. It was believed to have been the first word after Event One, coming out of the birthcries of the universe, when space was still small and sound could travel.

The Ish was a sentient affix to the Omniverbum that was found on Xenocubis. (AUDIO: ...ish)