Definition of sidero- in English:

sidero-

Pronunciation: /ˈsɪdərəʊ, ˈsʌɪ-/

combining form

Relating to the stars: siderostat

Origin

from Latin sidus, sider- 'star'.

Definition of sidero- in:

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Word of the day anomalous
Pronunciation: əˈnɒm(ə)ləs
adjective
deviating from what is standard, normal, or expected