1. SYN: formation. 2. A structure of definite shape or cellular arrangement. [L. fr. formo, pp. -atus, to form]
- f. reticularis [TA] SYN: reticular formation.
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for·ma·tio (for-maґshe-o) pl. formatioґnes [L.] formation: an anatomical structure of definite shape.Medical dictionary. 2011.