- A circular band surrounding a wide central opening; an anular or circular structure surrounding an opening or level area.
- The closed (endless) chain of atoms in a cyclic compound; commonly used for “cyclic” or “cycle.”
- A marginal growth on the upper surface of a broth culture of bacteria, adhering to the sides of the test tube in the form of a circle.
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Examples: glitazone, GI cocktail, etc.