| 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] |
| act of God |
in law, a sudden unforeseen event, esp. a natural disaster such as an earthquake, flood, or tornado, that is caused entirely by forces of nature and could not have been prevented. |
| actor |
one who plays roles in dramatic productions on stage, in films, or on radio and television. [2 definitions] |
| actress |
a woman or girl who plays roles in dramatic productions. |