One of the mysteries of the English language finally explained.
A pharmaceutical preparation originally marketed by the firm May and Baker, especially "M & B 693"noun the antibiotic sulphapyridine. Also, with distinguishing number: any of other pharmaceutical preparations manufactured by May and Baker. [A trademark in the United Kingdom. A symbol incorporating the letters M and B was registered as a trademark in 1935 (trademarks Jrnl. (1935) 30 Oct. 1349).]
1930s; earliest use found in The Lancet. From the initial letters of the May and Baker Co Ltd, pharmaceutical manufacturers.
M and B/ɛm (ə)n(d) biː/
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