| acrylonitrile |
a poisonous and carcinogenic liquid that is made into polymers for use as raw material in acrylic fibers. |
| act |
something done, esp. a specific instance; deed. [14 definitions] |
| actable |
capable of being acted, as a role or a play. |
| ACTH |
a hormone produced by the anterior pituitary that stimulates the cortex of the adrenal gland to produce cortisone and other hormones; adrenocorticotropic hormone. |
| actin |
any of a group of contractile proteins, including proteins involved in muscle contraction, cell motility, and maintenance of cellular shape. |
| acting |
appointed as a temporary substitute for someone absent from an office or position; serving temporarily. [5 definitions] |
| 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. |