| Arneth stages | A differential grouping of polymorphonuclear neutrophils in accordance with the number of lobes in their nuclei, i.e., cells with 1, 2, 3, 4, or 5 (or more) lobes are designated, respectively, as class I, II, and so on. See: Arneth formula. (05 Mar 2000) |
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| seral stages | The series of relatively transitory plant communities that develop during ecological succession from bare ground to the climax stage. (05 Dec 1998) |
| sleep stages | Periods of sleep manifested by changes in eeg activity and certain behavioural correlates; includes stage 1: sleep onset, drowsy sleep; stage 2: light sleep; stages 3 and 4: delta sleep, light sleep, deep sleep, telencephalic sleep. (12 Dec 1998) |
| life cycle stages | The continuous sequence of changes undergone by metamorphosing insects and other animals during the developmental process. (12 Dec 1998) |