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

• Synapsida
• synapsids
• synapsis
• synaptase
• synaptases
• synapte
• synaptes
• synaptic
• synarchies
• synarchy
• synarthrodial
• synarthrodially
• synarthroses
• synarthrosis
• synastries
• synastry
• synaxaria
• synaxarion
• synaxes
• synaxis
• synbiotic
• synbiotics
• sync
• syncarp
• syncarpies