his·tone 
(hĭstōn′)
(hĭstōn′)n.
Any of several basic proteins found in association with the DNA in the chromatin of eukaryotes.
- approbative
- approbatory
- appropriable
- appropriate
- appropriately
- appropriateness
- appropriation
- appropriative
- appropriator
- approvable
- approval
- approve
- approved school
- approvingly
- approximant
- approximate
- approximately
- approximation
- approximative
- approximatively
- appurtenance
- appurtenant
- APR
- Apr.
- apractic