formatio

formatio [fôr-mā′shē-ō] n. pl. for•ma•ti•o•nes (-mā′shē-ō′nēz)

1. A structure of definite shape or cellular arrangement; a formation.

Examples from the Web for formatio Historical Examples of formatio

The formatio reticularis which is feebly developed in the cord becomes well developed in the medulla.

Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 4

Various