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proplastid
proplyd
propman
propolis
proponent
proportion
proportional
proportional counter
proportional representation
proportional tax
proportionate
proposal
propose
proposita
propositi
proposition
propositional attitude
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prophylaxis

pro·phy·lax·is [ prfə láksiss, pròffə láksiss ] (plural pro·phy·lax·es [ prfə lák sz ])


noun 
Definition:
 
1. treatment to prevent disease: a treatment that prevents disease or stops it from spreading, e.g. vaccination

2. removal of plaque and tartar: a dental treatment to remove plaque and tartar from the teeth

[Mid-19th century. < modern Latin, "guarding in front of" < Greek pro "in front of" + phulaxis "guarding"]
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