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

tonomˈetry noun

• greyhens
• greyhound
• greyhounds
• greying
• greyings
• greyish
• grey knight
• grey knights
• greylag
• greylag geese
• greylag goose
• greylags
• grey literature
• greyly
• grey mare
• grey market
• grey markets
• grey matter
• grey mullet
• greyness
• greynesses
• grey-out
• grey-outs
• grey owl
• grey owls