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A memory worm was an alien worm that could remove the memories of those it touched.
Biology
A memory worm was covered with a substance that could remove an hour's memory from any being who touched it. The substance was also in the worm's fangs; if a worm bit an individual, the individual could lose years' worth of memories. (TV: The Snowmen)
History
A memory worm was in the possession of the Eleventh Doctor in 1892 London. He intended to use it to wipe Clara Oswin Oswald's memory of meeting him. However, his cohort Strax neglected to wear protective gauntlets while handling the worm, losing both his memory and the worm.
The memory worm was later recovered and used by the Doctor as part of a trap; the Doctor hid the worm inside a modern lunchbox, and gave it to Walter Simeon. The worm bit Simeon, causing him to lose the memories of his entire adult life. (TV: The Snowmen)