유

Etymology 1
, from the Middle Korean reading.

Noun

 * 1) existence, being

Prefix

 * 1) there is..., having...;

Etymology 2
, from the Middle Korean reading.

Noun

 * 1)  a family or genus
 * 1)  a family or genus

Usage notes
The prescriptive South Korean standard demands the pronunciation for this character when used as a noun, but  is by far the more common—the number of Google search results preliminarily suggest that  is about ten times more frequent than. South Korean legal documents also regularly use the "incorrect". In North Korea, only is accepted.

Etymology 3
From.

Etymology 4
Korean reading of various Chinese characters.