or 606 noun Etymology: from its having been the 606th compound tested and introduced by Paul Ehrlich died 1915 Date: 1910 arsphenamine
SIX-O-SIX
Meaning of SIX-O-SIX in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012