bass clef 
(bās)
(bās)n.
A symbol indicating that the pitch of the second highest line of the staff is F below middle C. Also called F clef.
bass clef- underwool
- underworld
- under wraps
- underwrite
- underwriter
- undescended testicle
- undeserved
- undeservedly
- undesigning
- undesirability
- undesirable
- undesirably
- undetermined
- undid
- undies
- undifferentiated
- undignified
- undine
- undiplomatic
- undiplomatically
- undirected
- undiscriminating
- undisposed
- undisputed
- undissociated