Designating cycles of physiological activity which recur with a period shorter than one day but longer than one hour. Cf. circadian, adj.
| 单词 | θ18338 |
| 释义 | the world > life > biology > biological processes > cycles of activity > [adjective] (2) ultradian1961 Designating cycles of physiological activity which recur with a period shorter than one day but longer than one hour. Cf. circadian, adj. Subcategories:— biorhythmic (1) |
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