The Collaborative International Dictionary of English v.0.48:
Ra \Ra\ (r[aum]), n. A roe; a deer. [Obs.] --Chaucer. [1913 Webster]The Collaborative International Dictionary of English v.0.48:
Ra- \Ra-\ A prefix, from the Latin re and ad combined, coming to us through the French and Italian. See Re-, and Ad-. [1913 Webster]