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actinism the property of radiation that produces chemical activity.
actinium a radioactive chemical element of the rare-earth group that has eighty-nine protons in each nucleus. (symbol: Ac)
actinogen any of the radioactive chemical elements.
actinoid having a radial or star-shaped form, as certain sea creatures.
actinomycin any of several antibiotics derived from soil bacteria that work against certain other bacteria and fungi.
actinomycosis an infectious disease of animals and humans that is caused by parasites and produces abscesses, esp. in the jaws.
actinozoan see anthozoan.
action something that is done, is being done, or will be done. [8 definitions]
actionable providing legitimate grounds for legal action.
actionless combined form of action.
action verb a verb that shows its subject performing some action. "Run," "eat," "fly," and "sing" are examples of action verbs.
activate to initiate action in; make active. [5 definitions]
activated carbon a form of very porous and thus very absorbent carbon, produced by heating charcoal so as to empty out contained gases, and used to absorb other gases, recover solvents, deodorize, and the like; activated charcoal.
activated charcoal see activated carbon.
active constantly doing something; busy; energetic. [6 definitions]
active duty the status of full-time service or work, esp. in the military.
active immunity an organism's immunity to a disease because of its production of antibodies.
actively in a way that involves making an effort, taking action, or participating; not passively.
activism the belief in or practice of trying to make social or political changes through active, militant, or demonstrative involvement, esp. in particular issues.
activist one who advocates a cause with vigor or militance.
activity the condition or state of being active. [4 definitions]