Does the weapon have to distinctly say “Magical Weapon” in its text to be considered a magical weapon?

@JeremyECrawford Does the weapon have to distinctly say "Magical Weapon" in its text to be considered a magical weapon? Ex. Oathbow doesn't.

— Chris Martin (@CMSLOPOrion) April 20, 2017

If a magic item is in the weapon category, it is, indeed, a magic weapon. #DnD https://t.co/KnxNbD1Xqw

— Jeremy Crawford (@JeremyECrawford) April 20, 2017