Definition of notum in English:



  • The dorsal exoskeleton of the thorax of an insect.

    • ‘These mutant pupae have defects including shortened or bent legs, bristle defects, a split notum, and wing abnormalities.’
    • ‘The frizzled pathway has been shown to be a key regulator of planar polarity for hairs on the wing, ommatidia in the eye, and sensory bristles on the notum.’
    • ‘These animals typically had extreme morphological defects including split and malformed nota and greatly reduced eyes.’
    • ‘The notum is well-developed, but it is impossible to tell if the eyes are large or meet medially.’
    • ‘Of the three regions of adult cuticle scored for ectopic bristles, the dorsal notum had the largest number, so data from that region are likely to be most reliable.’


Late 19th century: from Greek nōton ‘back’.