IPA: //baɪˈaʊərli//
KK: /bɪˈhaʊərli/
Happening or taking place every two hours.
The medication should be taken bihourly to maintain its effectiveness.
Happening or occurring every two hours.
The train arrives bihourly, making it easy to travel throughout the day.
Bihourly → It is formed from "bi-" (meaning two) and "hour" (from Old French *oure*, meaning a period of 60 minutes). The suffix "-ly" (meaning in a manner) indicates frequency. Thus, bihourly means occurring every two hours.
Think of 'bi-' meaning two and 'hour' referring to a period of time — so bihourly means something that happens every two hours.