There are 13 10-letter words that start with 'cir'.
| circuities | circuiting | circuitous | 
| circularly | circulated | circulates | 
| circulator | circumcise | circumflex | 
| circumfuse | circumvent | cirrhotics | 
| cirripedes | ||
Note: These 13 10-letter words that start with 'cir' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with circ, cirr, cire, cirq, cirs.
4-letter words start with 'cir' (1)