#1 TOP DEFINITION
An official or community-recognized position within a K-pop group awarded to the member considered the most conventionally attractive. The 'visual' is essentially the face of the group, often the one who appears most prominently in promotional materials.
Example
“Jisoo is BLACKPINK's official visual — her face frequently appears on billboards and brand campaigns.”
#2
Beyond just the official position, 'visual' can describe any member who is considered particularly attractive by the fandom or general public, even if they don't hold the official position.
Example
“All the members are visuals in my opinion — I can't pick just one.”
Heard in Lyrics
Heard from an Idol
Watch how K-pop idols actually use this term
YOUTUBEBLACKPINK — Jisoo focus—Jisoo — officially the group's "visual" and why