scarlet letter noun (historical)

A scarlet-coloured letter A worn by women convicted of adultery in the Puritan communities of New England

scarlet pimpernel noun

A flowering plant, Anagallis arvensis, of the primrose family, with small red, white or purple flowers that close when the weather is cloudy

scarlet runner noun

A scarlet-flowered climber (Phaseolus multiflorus) of the kidney bean genus, with edible beans

scarlet woman noun

1. The woman referred to in the Bible (Revelation 17), variously interpreted as pagan Rome, Papal Rome, or the world in its anti-Christian sense
2. A whore