also: こうちゃきのこ
noun
kombucha
A fermented tea drink originally from northern China, made by fermenting sweetened tea with a symbiotic culture of bacteria and yeast (SCOBY). Not related to 昆布茶 (kelp tea).
最近、健康のために紅茶キノコを飲み始めた。
Recently, I started drinking kombucha for my health.
紅茶キノコは発酵飲料の一種です。
Kombucha is a type of fermented beverage.
昆布茶 is a Japanese kelp tea, completely different from 紅茶キノコ (kombucha). Despite the similar name, they are unrelated beverages.
The Japanese name 紅茶キノコ literally means 'black tea mushroom', referring to the gelatinous SCOBY that resembles a mushroom. The word 'kombucha' is borrowed from Japanese, but in English it refers to this fermented tea, not kelp tea.