o·ver·ac·tive 
(ō′vər-ăktĭv)
(ō′vər-ăktĭv)adj.
Active to an excessive or abnormal degree: an overactive pituitary gland; an overactive imagination.
o′ver·ac·tivi·ty n.
- accessory mineral
- accessory nerve
- accessory pigment
- access road
- access time
- acciaccatura
- accidence
- accident
- accidental
- accidentally
- accident insurance
- accidently
- accident-prone
- accipiter
- accipitrine
- acclaim
- acclaimer
- acclamation
- acclamatory
- acclimate
- acclimation
- acclimatization
- acclimatize
- acclimatizer
- acclivitous