Frequent commenter Tatyana just sent me the word ouguiya, which is in the dictionary and legal for Scrabble use.    From Wordnik.com.  [languagehat.com: OUGUIYA AND ARIARY.] Reference

Just one more before we quit this topic: the Mauritanian ouguiya!.    From Wordnik.com.  [Summit Daily News - Top Stories] Reference

The association of money names with other weights is common: ouguiya (Mauritania) means.    From Wordnik.com.  [VERBATIM: The Language Quarterly Vol XI No 4] Reference

Surely we would like to buy this little souvenir he has, from Mali, over 200 years old, for only 20,000 ouguiya ….    From Wordnik.com.  [Planet Nomad] Reference

The Wikipedia article I linked to goes on to say "The only circulating currency other than the Malagasy ariary whose division units are not based on a power of ten, each ouguiya is comprised of five khoums (singular and plural in English; Arabic: خمس)"; this sent me to the article ariary, where I learned that "The ariary replaced the previous currency, the Malagasy franc (also known as by its French name, the franc malgache)..., on January 1, 2005.    From Wordnik.com.  [languagehat.com: OUGUIYA AND ARIARY.] Reference

Currency: ouguiya (MRO).    From Wordnik.com.  [The 2004 CIA World Factbook] Reference

Mauritania ouguiya (MRO).    From Wordnik.com.  [The 2004 CIA World Factbook] Reference

Mauritania: ouguiya (MRO).    From Wordnik.com.  [The 2001 CIA World Factbook] Reference

Currency (code): ouguiya (MRO).    From Wordnik.com.  [The 2007 CIA World Factbook] Reference

Currency: 1 ouguiya (UM) = 5 khoums.    From Wordnik.com.  [The 1999 CIA Factbook] Reference

1 ouguiya (UM) = 5 khoums.    From Wordnik.com.  [The 1994 CIA World Factbook] Reference