formaldehyde /för-malˈdi-hīd/

A formic aldehyde, formalin

• back-up
• backup
• backup file
• backup files
• backup light
• backup lights
• backups
• backveld
• backvelder
• backvelders
• backvelds
• backward
• backward and forward
• backwardation
• backwardations
• backward-looking
• backwardly
• backwardness
• backwardnesses
• backwards
• backwards-compatible
• backwash
• backwashed
• backwashes
• backwashing