noun[mass noun] Botany
A specialized layer in a root beneath the epidermis or velamen.
- In the endodermis and exodermis of roots, the apoplastic flow component can be modified by the existence of apoplastic barriers.
- There were no visible differences in the development of endodermis, exodermis and aerenchyma between the two varieties and growth conditions.
- Thus, water channels in the epidermis and/or exodermis of the older regions were especially significant for water flow.
Early 20th century: from exo- 'outside', on the pattern of endodermis, epidermis.
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