th- root words — words with the th- root

The root th- comes from Old English otha, meaning ordinal marker. 1 words in Dendril are built from it, including decillionth. 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 "ordinal marker". Examples include decillionth. Click any word to see its own roots, definition, and related words.

What does th- mean?

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