Definitions
from The Century Dictionary.
- noun The third of the ganglionic swellings which compose the optic tract in the brain of an insect.
Etymologies
Sorry, no etymologies found.
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Examples
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Neurospongium: a granular matrix in the periopticon of the insect eye.
Explanation of Terms Used in Entomology John. B. Smith
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Opticon: the first of a series of three ganglionic swellings in the optic nerve: see epiopticon and periopticon.
Explanation of Terms Used in Entomology John. B. Smith
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