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protomorphic
proton
proton number
proton pump
proton pump inhibitor
proton synchrotron
protonema
protonics
protonotary
protoplanet
protoplasm
protoplast
protoporphyrin
protostar
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prototrophic
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protractile
pro·trac·tile [ prō trákt'l, prə trákt'l ]


adjective 
Definition:
 
1. that can be protruded: capable of being thrust out
2. zoology 
Same as  protrusile
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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