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sidepiece
sider-
sidereal
sidereal day
sidereal hour
sidereal month
sidereal period
sidereal time
sidereal year
siderite
sidero-
sideroad
siderolite
siderophilin
siderosis
siderostat
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sidereal year
si·de·re·al year (plural si·de·re·al years)


noun 
Definition:
 
one revolution around Sun: the time it takes the Sun to make one revolution with reference to a given star, equal to 365 days, 6 hours, 9 minutes, 9.5 seconds
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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