opsiometer /op-si-omˈi-tər/

An optometer

• back-country
• backcourt
• backcourts
• back-crawl
• back-cross
• back-crossed
• back-crosses
• back-crossing
• back-date
• back-dated
• back-dates
• back-dating
• back door
• backdoor
• back doors
• back down
• backdown
• back-draught
• back-draughts
• backdrop
• backdrops
• backed
• back-end
• back-ends
• backer