halfhourly

[ haf-ouuh r-lee, -ou-er-, hahf- ]
/ ˈhæfˈaʊər li, -ˈaʊ ər-, ˈhɑf- /

adjective

half-hour(def 3).
occurring every half-hour: a halfhourly interruption.

adverb

at half-hour intervals: The bell rang halfhourly.

Origin of halfhourly

First recorded in 1800–10; half + hourly

Words nearby halfhourly

half-witted, half-year, halfback, halfbeak, halfhearted, halfhourly, halfies, halfmoon, halfpenny, halfpennyworth, halfsies