noun
night jessamine; night jasmine; lady of the night; queen of the night
A flowering shrub (Cestrum nocturnum) known for its strong nighttime fragrance. The name is usually written in katakana.
庭にヤコウボクを植えたら、夜になると甘い香りが漂ってきた。
When I planted a night jessamine in the garden, a sweet fragrance drifted in at night.
From 夜 (yo, 'night') + 香 (kō, 'fragrance') + 木 (boku, 'tree'). The exact derivation is uncertain, but the name refers to the plant's strong nighttime scent.