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actinium
actino-
actinolite
actinometer
actinomorphic
actinomycete
actinomycin
actinomycosis
actinopterygian
actinouranium
action
action figure
action game
action group
action item
action man
action movie
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actin
ac·tin [ áktin ]


noun 
Definition:
 
protein involved in cell movement: a protein present in all cells and in muscle tissue where it plays a role in contraction
[Mid-20th century. < Latin actus (see act)]
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