Interesting antedatings

Revision of the entries in the June OED Online update has revealed an earlier origin than previously thought for many words, including:

• megabyte (antedated to 1965 from 1973)
• melancholy adj. (a1393 from 1526)
• membrane (?a1425 from 1519)
• memo (1705 from 1889)
• memorably (1608 from 1755)