One of the mysteries of the English language finally explained.
In a chiton: any of the numerous photoreceptive sensory structures distributed in megalopores over the surface of the valves.
Late 19th century; earliest use found in Henry Nottidge Moseley (1844–1891), naturalist. From megalo- + ancient Greek αἰσθητής person who perceives, here used for ‘organ of sense’; apparently coined by H. N. Moseley.
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