- A certain duration or division of time.
- One of the stages of a disease, period of incubation, period of convalescence.
- Colloquialism for menses.
- Any of the horizontal rows of chemical elements in the periodic table.
[G. periodos, a way round, a cycle, fr. peri, around, + hodos, way]
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Examples: glitazone, GI cocktail, etc.