tonometer /tō-nomˈə-tər/

1. A device for determining the frequencies of tones, esp one consisting of tuning forks (music)
2. An instrument for measuring fluid pressure (eg within the eyeball), blood pressure or vapour pressure

• threatens
• threatful
• threating
• threats
• threave
• threaves
• three
• three balls
• three bells
• three-bottle
• three-bottle man
• three-card
• three-card monte
• three-card trick
• three-card tricks
• three-centred
• three cheers
• three-cleft
• three-colour
• three-colour process
• three-cornered
• three-D
• three-day event
• three-day eventer
• three-deck