1. PEA
Originally the word was “pease,” and it was singular. (“The Scottish or tufted Pease..is a good white Pease fit to be eaten.”) The sound on the end was reanalyzed as a plural ‘s’ marker, and at the end of the 17th Century people started talking about one “pea.” The older form lives on in the nursery rhyme “Pease-porridge hot, pease-porridge cold…”
via Mental Floss
