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お邪魔虫;御邪魔虫 [おじゃまむし]

someone who gets in the way without serving any useful purpose/fly in the ointment/buttinsky/third wheel (noun (common) (futsuumeishi))

きちきち蝗虫 [きちきちばった;キチキチバッタ]

(noun (common) (futsuumeishi))

(1) (See 精霊飛蝗) male Oriental longheaded locust (Acrida cinerea) (word usually written using kana alone) (colloquialism)

(2) (See 精霊飛蝗擬) Gonista bicolor (species of grasshopper resembling the Oriental longheaded locust) (obsolete term)

くっつき虫;くっ付き虫 [くっつきむし]

(See ひっつき虫) burr (prickly seeds or seedheads that stick to fur and clothes) (noun (common) (futsuumeishi))

こたつ虫;炬燵虫 [こたつむし]

(pun on かたつむり) (See こたつ,こたつむり) someone who curls up under a kotatsu all winter/kotatsu bug/kotatsu snail (noun (common) (futsuumeishi)) (colloquialism)

ざざ虫 [ざざむし]

(in Shinshu) dobsonfly or stonefly larva (noun (common) (futsuumeishi))

でで虫;出出虫 [ででむし]

snail (noun (common) (futsuumeishi)) (archaism)

ひっつき虫;引っ付き虫 [ひっつきむし]

(See くっつき虫) burr (prickly seeds or seedheads that stick to fur and clothes) (noun (common) (futsuumeishi))

アペンディサイティス

(See 虫垂炎) appendicitis (noun (common) (futsuumeishi))

アメリカ鉤虫 [アメリカこうちゅう]

New World hookworm (Necator americanus) (noun (common) (futsuumeishi))

イセリア介殻虫 [イセリアかいがらむし;イセリアカイガラムシ]

cottony cushion scale (species of scale insect, Icerya purchasi) (noun (common) (futsuumeishi)) (word usually written using kana alone)