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protoplasm
protoplast
protoporphyrin
protostar
protostome
prototherian
prototrophic
prototype
protoxide
protozoan
protozoology
protozoon
protract
protracted
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protraction
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protyle
pro·tyle [ prṓ tl ]


noun 
Definition:
 
imaginary substance: an imaginary substance from which the chemical elements were supposed to have been formed
[Late 19th century. <proto- + Greek hulē "matter"]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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