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Sedna Syllabification: Sed·na
Pronunciation: /ˈsednə/

Entry from US English dictionary

Definition of Sedna in English:

Astronomy A reddish celestial body about half the size of earth’s moon. It is the most distant known object in the solar system and orbits the sun every 10,500 years.

Definition of Sedna in:

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Word of the day fortissimo
Pronunciation: fɔːˈtɪsɪməʊ
adverb
(especially as a direction) very loud or loudly