Definition of folium in English:

folium

Syllabification: fo·li·um
Pronunciation: /ˈfōlēəm
 
/

noun (plural folia /-lēə/)

technical
A thin leaflike structure, e.g., in some rocks or in the cerebellum of the brain.
More example sentences
  • In case 3, however, we noted Purkinje neuronal drop-out, gliosis, and proliferation of microglial nodules in the cerebellar folia.
  • Immediately above the lingula, four or five folia constitute the central lobule of the vermis, which is continuous laterally with the ala of the central lobule.
  • This folium was first discussed by Descartes in 1638.

Origin

mid 18th century: from Latin, literally 'leaf'.

Definition of folium in:

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