furan /fūˈran or fū-ranˈ/, also furane /-rān/

1. A colourless liquid heterocyclic compound, C₄H₄O, obtained from wood tar or synthesized, and used in tanning and nylon production (also furˈfuran /-fū- or -fə-/)
2. Any of a group of heterocyclic compounds derived from furan

• understorey
• understoreys
• understories
• understory
• understrapper
• understrappers
• understrapping
• understrata
• understratum
• understudied
• understudies
• understudy
• understudying
• undersubscribed
• undersupplies
• undersupply
• undersurface
• undersurfaces
• under suspicion
• underta'en
• undertakable
• undertake
• undertaken
• undertaker
• undertakers