th- root words — words with the th- root

The root th- comes from Old English tha, meaning forming ordinal. 8 words in Dendril are built from it, including billionth, dozenth, nonillionth, octillionth, quintillionth, septillionth, sextillionth, zeroth. Dendril shows them on a free interactive word map — no signup, no ads.

Words that use the th- root

Explore words with th- — words containing the th- root and sharing its sense of "forming ordinal". Examples include billionth, dozenth, nonillionth, octillionth, quintillionth, septillionth, sextillionth, zeroth. Click any word to see its own roots, definition, and related words.

What does th- mean?

The th- root means forming ordinal, from Old English tha. Recognizing it helps you decode and remember the many English words built on this root.