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fermion
fermium
fern
fern bar
fern seed
Fernando de Noronha
Fernando Póo
fernbird
fernery
ferntickles
ferocious
-ferous
ferr-
Ferrara
ferredoxin
ferret (1)
ferret (2)
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Fermat’s principle
Fer·mat's prin·ci·ple


noun 
Definition:
 
principle involving light-ray path: a principle stating that a ray of light passing between two points will follow the path that takes the least time
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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