Main Entry:

tri·ath·lon

Pronunciation:

\trī-ˈath-lən, -ˌlän, ÷-ˈa-thə-\

Function:

noun

Etymology:

tri- + -athlon (as in decathlon)

Date:

1973

: an athletic contest that is a long-distance race consisting of three phases (as swimming, bicycling, and running)