Etymology 1
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Compound of 祖父 (ōji, “grandad, old man”) + が (ga, “-'s”, Old Japanese possessive particle) + 陰嚢 (fuguri, “scrotum”),[1][2][3][4] presumably from a vague visual similarity. The spelling is from Middle Chinese. First cited in the 本草和名 (Honzō Wamyō, “Japanese Names of Medicinal Plants”), the oldest surviving medical work in Japanese.[1]
Noun
螵蛸 • (ōjigafuguri) ←おぽぢがふぐり (opodigafuguri)?
- [from 918] a mantis egg case
- Synonyms: (egg case in general) 卵塊 (rankai), 卵鞘 (ranshō)
Etymology 2
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Might be from Middle Chinese 螵蛸 (MC phjiew sjew), or might instead be a relatively recent borrowing from written Chinese 螵蛸 (piāoxiāo). This hyōshō pronunciation is not listed in dictionaries consulted to date,[1][2][3][4][5] and online searches of the Japanese web suggest that this pronunciation might be limited to Chinese medicine contexts.