sinewealt

Old English

From Proto-Germanic *sinwaltaz. Equivalent to sin- +‎ *wealt, from Proto-Germanic *waltaz (“changing; unstable”), from Proto-Indo-European *wel- (“to turn; wind; twist”).

sinewealt

round (circular, spherical, or cylindrical)
Aristotelēs cwæþ on Be Heofonum þæt þǣre Eorðan sċadu wǣre sinewealt on mōnan āsprungennesse.
Aristotle said in On the Heavens that the Earth's shadow was round during a lunar eclipse.

Declension of sinewealt — Strong

Singular	Masculine	Feminine	Neuter
Nominative	sinewealt	sinewealt	sinewealt
Accusative	sinewealtne	sinewealte	sinewealt
Genitive	sinewealtes	sinewealtre	sinewealtes
Dative	sinewealtum	sinewealtre	sinewealtum
Instrumental	sinewealte	sinewealtre	sinewealte
Plural	Masculine	Feminine	Neuter
Nominative	sinewealte	sinewealta, sinewealte	sinewealt
Accusative	sinewealte	sinewealta, sinewealte	sinewealt
Genitive	sinewealtra	sinewealtra	sinewealtra
Dative	sinewealtum	sinewealtum	sinewealtum
Instrumental	sinewealtum	sinewealtum	sinewealtum

Declension of sinewealt — Weak

Singular	Masculine	Feminine	Neuter
Nominative	sinewealta	sinewealte	sinewealte
Accusative	sinewealtan	sinewealtan	sinewealte
Genitive	sinewealtan	sinewealtan	sinewealtan
Dative	sinewealtan	sinewealtan	sinewealtan
Instrumental	sinewealtan	sinewealtan	sinewealtan
Plural	Masculine	Feminine	Neuter
Nominative	sinewealtan	sinewealtan	sinewealtan
Accusative	sinewealtan	sinewealtan	sinewealtan
Genitive	sinewealtra, sinewealtena	sinewealtra, sinewealtena	sinewealtra, sinewealtena
Dative	sinewealtum	sinewealtum	sinewealtum
Instrumental	sinewealtum	sinewealtum	sinewealtum