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| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| actino- or (before a vowel) actin- | |
| —combining form | |
| 1. | indicating a radial structure: actinomorphic |
| 2. | indicating radioactivity or radiation: actinometer |
| [from Greek aktino-, from aktis beam, ray] | |
| actin- or (before a vowel) actin- | |
| —combining form | |
| [from Greek aktino-, from aktis beam, ray] | |
actino- or actin-
pref.
Actinic radiation: actinotherapy.