also: クッソか
noun
kousso; kosso; cusso; koso
Rare term for a vermifuge made from pistillate brayera flowers. The word is a direct loan from the plant name, with multiple spelling variants reflecting different transliterations.
See also: 苦蘇
コソ花は、かつて条虫駆除に用いられた生薬である。
Kousso is a crude drug that was once used to expel tapeworms.
苦蘇 is a shorter form referring to the same plant or drug, without the 花 (flower) component.
Borrowed from the plant name 'kousso' (Hagenia abyssinica), likely via European languages. The kanji 苦蘇花 are ateji, with 花 meaning 'flower'.