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prothallus
prothesis
prothonotary
prothonotary warbler
prothoracic gland
prothrombin
protist
protium
proto-
Proto-Algonquian
Proto-Germanic
Proto-Indo-European
Proto-Norse
proto-oncogene
Proto-Romance
Proto-Semitic
protoceratops
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proto-
proto-


prefix 
Definition:
 
1. first in time, earliest
protolithic
protomartyr
2. original, ancestral
protostar
Proto-Norse
3. first in a series, having the least amount of a particular element or radical
protactinium
[< Greek prōtos]
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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