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in the PONS Dictionary

arcus <ūs> m

1.

arcus
Bogen (als Waffe)
arcum intendere
arcūs Haemonii meton.
der Schütze (als Sternbild)

2.

arcus
Regenbogen [ caelestis; pluvius; imbrifer ]

3. poet; nachkl.

arcus
Krümmung, Windung
anguis sinuatur in arcus
arcus aquarum
Wasserberg

4.

a.

arcus
Wölbung (v. Bauwerk, v. Brückenbogen);

b. nachkl.

arcus
Triumphbogen

5. MATH

arcus poet; nachkl.
Kreisbogen
Declension for arcus
Case Singular Plural
Nominative arcus arcūs
Genitive arcūs arcuum
Dative arcuī arcibus
Accusative arcum arcūs
Ablative arcū arcibus