One of the mysteries of the English language finally explained.
A ram having only one testicle, or only one testicle descended.
Mid 16th century. Apparently ultimately from rig, although the origin of the ending is uncertain. With the same sense compare earlier rig, riggald, slightly earlier riggot, rigling, and also ridgel, ridgeling. For the likely semantic motivation of these words, see rig.
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