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red lamp1785
a lamp with red glass, used (a) †as the sign of a doctor (obsolete) (b) as the sign of a brothel (in later use, chiefly attributive; cf. red light, n.…
red cross1866
A red cross as the international symbol of the nursing and ambulance service of the same name (see sense 3b); = Geneva crossn. at Geneva, n. 4b.