- The act of permeating or penetrating into a substance, cell, or tissue; said of gases, fluids, or matter held in solution.
- The gas, fluid, or dissolved matter that has entered any substance, cell, or tissue.
- Injection of solution into tissues, as in infiltration anesthesia.
- Extravasation of solutions intended for intravascular injection.
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Examples: glitazone, GI cocktail, etc.