| actinic |
of or pertaining to the chemical property of ultraviolet radiation and x-rays that produces photochemical effects. |
| actinic rays |
electromagnetic radiation, such as x-rays or ultraviolet light, that can produce an image on a photographic emulsion. |
| actinide |
any of the chemical elements of the actinide series. |
| actinide series |
the series of chemical elements, mostly synthetic and all radioactive, that have from eighty-nine to 103 protons per atom. |
| 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. |
| action-adventure |
a genre of films, video games, and the like having an exciting undertaking involving risk and danger as its main story line, and involving one or more heroes engaged in a series of physical challenges. [2 definitions] |
| actionless |
combined form of action. |
| action movie |
a film whose story line focuses on conflict and fast-paced activity, esp. involving physical violence, feats of strength and agility, and chase scenes. |
| action-packed |
of a film, video, story, or the like, filled with scenes depicting action, danger, and exciting events. |
| 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. [6 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." |