rock-a-bye also rock·a·bye or rock·a·by 
(rŏkə-bī′)
(rŏkə-bī′)interj.
Used to lull an infant or child to sleep.
[ROCK2 + (LULL)ABY.]
- appreciatory
- apprehend
- apprehender
- apprehensible
- apprehensibly
- apprehension
- apprehensive
- apprehensively
- apprehensiveness
- apprentice
- apprenticeship
- appressed
- appressorium
- apprise
- apprize
- approach
- approachability
- approachable
- approbate
- approbation
- approbative
- approbatory
- appropriable
- appropriate
- appropriately