| Actinium |
| A supposed metal, said by Phipson to be contained in
commercial zinc; -- so called because certain of its compounds are
darkened by exposure to light. |
| Actino-chemistry |
| Chemistry in its relations to actinism. |
| Actinograph |
| An instrument for measuring and recording the
variations in the actinic or chemical force of rays of light. |
| Actinoid |
| Having the form of rays; radiated, as an actinia. |
| Actinolite |
| A bright green variety of amphibole occurring usually
in fibrous or columnar masses. |
| Actinolitic |
| Of the nature of, or containing, actinolite. |
| Actinology |
| The science which treats of rays of light, especially
of the actinic or chemical rays. |
| Actinomere |
| One of the radial segments composing the body of one of
the Coelenterata. |
| Actinometer |
| An instrument for measuring the direct heating power
of the sun's rays. |
| Actinometer |
| An instrument for measuring the actinic effect of rays
of light. |
