In a manner characteristic of hermaphrodites, or possessing both male and female qualities; in a way that combines opposite characteristics.
From 'hermaphroditical' plus the adverbial suffix '-ly'; this word developed when scholars needed to describe actions or states that combined both sexual characteristics.
This adverb is rarely used in modern science, but it shows how Victorian scientists turned everything into elaborate adverbs—they couldn't just say 'with both sexes,' they had to say it hermaphroditically.
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