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

• insuring
• insurmountability
• insurmountable
• insurmountableness
• insurmountably
• insurrection
• insurrectional
• insurrectionary
• insurrectionism
• insurrectionist
• insurrectionists
• insurrections
• insusceptibility
• insusceptible
• insusceptibly
• insusceptive
• insusceptively
• inswathe
• inswing
• inswinger
• inswingers
• inswings
• in sympathy
• in sympathy with
• in sync