In entomology, the notum (plural nota) is the dorsal portion of an insect`s thoracic segment. Typically the notum is a single large sclerite, but often it is divided into the alinotum which bears the wings and the postnotum which bears the phragma. The phragma, or endotergite, is a transverse infolding of the intersegmental sclerite, and its main....
• (n.) The back. • (n.) The back.
The dorsal or upper surface of any thoracic segment: usually prefixed by pro-, meso-, or meta- to indicate the relevant segment.
No'tum noun ; plural Nota . [ New Latin , from Greek ....] (Zoology) The back. 
Dorsal sclerite of thoracic segment.
the dorsal or upper part of a body segment, particularly of the thorax. See tergum.
a dorsal plate or sclerite of the thorax of an insect.