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Northern blot
A technique in molecular biology, used mainly to separate and identify pieces of RNA. Called a Northern blot only because it is similar to a Southern blot (which is named after its inventor, the British biologist M.E. Southern). There is also a Western blot.

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North·ern blot 'nȯr-thərn- n a blot consisting of a sheet of cellulose nitrate or nylon that contains spots of RNA for identification by a suitable molecular probe compare SOUTHERN BLOT, WESTERN BLOT
Northern blot·ting -'blät-iŋ n

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[by analogy to Southern blot] a method analogous to a Southern blot (q.v.), but performed on fragments of RNA instead of DNA; the probe may be either DNA or RNA.

Medical dictionary. 2011.