cross·bones 
(krôsbōnz′, krŏs-)
(krôsbōnz′, krŏs-)pl.n.
A representation of two bones placed crosswise, usually under a skull, symbolizing danger or death.
- improper fraction
- improper integral
- improperly
- improperness
- impropriety
- improv
- improvable
- improvably
- improve
- improvement
- improvidence
- improvident
- improvidently
- improvisation
- improvisational
- improvisationally
- improvisator
- improvisatorial
- improvisatory
- improvise
- improviser
- improvisor
- imprudence
- imprudent
- imprudently