精通 (せいつう)having deep knowledge of; being expert in; being well versed in

having deep knowledge of; being expert in; being well versed innoun (common) (futsuumeishi), noun or participle which takes the aux. verb suru
(a boy's) first ejaculation; semenarchenoun (common) (futsuumeishi), noun or participle which takes the aux. verb suru

精通, its kanji, and other words that share them.Open this graph

Kanji in 精通

精神せいしんmind; spirit
精せいspirit; sprite
精神的せいしんてきmental; spiritual
精子せいしsperm
精密せいみつprecise; exact
受精卵じゅせいらんfertilized egg; fertilised egg
精製せいせいrefining; purification
精度せいどprecision; accuracy
見通しみとおしunobstructed view; perspective
通信つうしんcorrespondence; communication
交通こうつうtraffic; transportation
共通きょうつうcommon; shared
普通ふつうnormal; ordinary
通常つうじょうusual; ordinary
通産省つうさんしょう(former) Ministry of International Trade and Industry (now Ministry of Economy, Trade and Industry); MITI
通貨つうかcurrency

See how 精通 connects to the rest of Japanese.