anaptyxis
Concise Oxford English Dictionary © 2008 Oxford University Press:
anaptyxis /ˌanəpˈtɪksɪs/
▶noun Phonetics the insertion of a vowel between two consonants to aid pronunciation, as in he went thataway.
– derivatives
anaptyctic adjective.
anaptyctic adjective.
– origin C19: mod. L., from Gk anaptuxis ‘unfolding’.
'anaptyxis' also found in these Oxford entries:

