The Collaborative International Dictionary of English v.0.48:

Reis \Re`is\ (r?"?s or r?z), n. [Pg., pl. of real, an ancient
   Portuguese coin.]
   The word is used as a Portuguese designation of money of
   account, one hundred reis being about equal in value to
   eleven cents.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Reis \Reis\ (r[imac]s), n. [Ar. ra["i]s head, chief, prince.]
   A common title in the East for a person in authority,
   especially the captain of a ship. [Written also rais and
   ras.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Rei \Rei\ (r?), n.;pl. Reis (r?"?s or r?z). [Pg. real, pl.
   reis. See Real a coin.]
   A portuguese money of account, in value about one tenth of a
   cent. [Spelt also ree.]
   [1913 Webster]