What does "cowpea" mean?

Cowpea: The seed of one or more leguminous plants of the genus Dolichos; also, the plant itself. Many varieties are cultivated in the southern part of the United States. COWPER'S GLANDS Cow"per's glands` (kou"prz glndz`). Etym: [After the discoverer, William Cowper, an English surgeon.] (Anat.) Two small glands discharging into the male urethra.

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