biennial /bī-enˈi-əl or -enˈyəl/

1. Lasting two years
2. Happening or appearing once in two years

1. A plant that flowers and fruits only in its second year, then dies
2. An event taking place or being celebrated every two years

biennˈially adverb

• organogenies
• organogeny
• organogram
• organograms
• organographies
• organography
• organoleptic
• organometallic
• organon
• organophosphate
• organophosphates
• organotherapeutic
• organotherapies
• organotherapy
• organ-pipe
• organ-pipe coral
• organ-pipes
• organ-point
• organ-points
• organs
• organ-screen
• organ-screens
• organum
• organza
• organzas