Definition of sidero- in English:

sidero-1

Pronunciation: /ˈsɪdərəʊ, ˈsʌɪ-/

combining form

  • Relating to the stars: siderostat

Origin

from Latin sidus, sider- 'star'.

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Word of the day kerf
Pronunciation: kəːf
noun
a slit made by cutting with a saw