There are 2 definitions of Cu in English:

Cu1

Line breaks: Cu

symbol

The chemical element copper.

Origin

from late Latin cuprum.

Definition of Cu in:

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Word of the day antebellum
Pronunciation: ˌantɪˈbɛləm
adjective
occurring or existing before a particular war…

There are 2 definitions of Cu in English:

CU2

Line breaks: CU

abbreviation

1Christian Union.
1.1 informal See you.