amphibology
Concise Oxford English Dictionary © 2008 Oxford University Press:
amphibology /ˌamfɪˈbɒlədʒi/
▶noun (pl. amphibologies) a phrase or sentence that is grammatically ambiguous.
– origin ME: from OFr. amphibologie, from late L. amphibologia, from L. amphibolia, from Gk amphibolos ‘ambiguous’.
'amphibology' also found in these Oxford entries:

