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spermophile
-spermy
Sperrin Mountains
sperrylite
spessartine
spew
Spey
Speyer
SPF
Spgs.
sphagnum
sphalerite
sphecid
sphen-
sphene
spheno-
sphenodon
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SPF
SPF (plural SPFs)


noun 
Definition:
 
protection factor against sun: the degree to which a sun cream, lotion, screen, or block provides protection for the skin against the sun.
Full form  sun protection factor
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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