Wasei kango: a Japanese coinage based on Chinese. First found during the Meiji Period, later borrowed into Chinese.
Compound of 母 (bo, “mother”) + 艦 (kan, “warship”). Calque of English mother ship.
母艦 (hiragana ぼかん, romaji bokan)
- a mother ship (specifically a water craft)
- short for 航空母艦 (kōkū bokan, “aircraft carrier”)
Derived terms 
- 聯合艦隊出征報告 (Rengō Kantai Shussei Hōkoku [Report on Combined Fleet Campaigns]), 大本營海軍參謀部 (Dai Hon'ei Kaigun Sanbō-bu: Imperial HQ, Navy Staff Section), Tōkyō, 1894, page 183 (in Japanese). Retrieved 2012-06-22.
- "本隊ノ六隻第二遊撃隊ノ六隻本隊附属八重山、天城ノ二艦（磐城ハ本隊ト行違ニ淺水XXニ赴ケルモノ、如シ近江丸ハ本日佐世保ヨリ到着ノ見込）外ニ第一遊撃隊ノ秋津洲、水雷艇隊ノ母艦山城丸" (XX = illegible character)
母艦 (traditional, Pinyin mǔjiàn, simplified 母舰)
- mother ship
Derived terms