Vocabulary What does 琵琶湖 (びわこ, biwako) mean? 琵琶湖 (びわこ, biwako) means Lake Biwa; Biwako. Quick factsReadingびわこRomajibiwakoPart of speechnoun 琵琶湖びわこbiwakoLake Biwa; Biwako1noun Lake Biwa; BiwakoAlso written: びわ湖Kanji in this word湖lake