dipleidoscope /di-plīˈdə-skōp/

An instrument for ascertaining the moment of meridian passage by observing the coincidence of two images

• positron emission tomography scanner
• positron emission tomography scanners
• positronium
• positroniums
• positrons
• posits
• posnet
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• posological
• posologies
• posology
• poss
• posse
• posse comitatus
• possed
• posser
• possers
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• possessable
• possessed
• possesses
• possessing
• possession
• possessional