I would just say "wolf" fifth [quinte-Du-loup or diabolus in musica].

Wolf tone - Wikipedia, the free encyclopedia
This article is about artificial overtones in musical instruments. ... older device on cellos was a fifth string that could be tuned to the wolf frequency; ...
www.en.wikipedia.org/wiki/Wolf_tone - Cached -

http://www.ericweisstein.com/encyclopedias/music/WolfFifth.h...
In the mean tone scale, the C:E' frequency ratio is defined to be exactly 5 instead of the expected . The discrepancy between four fifths and a seventeenth is , known as the comma of Didymus), and required that each whole step have a ratio of instead of the 3/2=1.5 of the exact fifth. When the scale was started at C and carried four such steps backwards and eight such steps forward (E, B, F, C, G, D, A, E, B, F, C, and G), the G-E interval consisted of 12 mean tone whole steps ), whereas 12 fifths would be . This produced cacophony and was therefore known as a ***wolf fifth, also called a quinte-Du-loup or diabolus in musica.***

Songstuff: In Search Of The Imperfect Fifth
Temperament affects the tuning of musical instruments. ... This necessitated having eleven pure fifths and one small (wolf) fifth that sounded disturbingly ...
www.recording.songstuff.com/article/the_imperfect_fifth -

HTH!