terza rima
Concise Oxford English Dictionary © 2008 Oxford University Press:
terza rima /ˌtɛːtsə ˈriːmə/
▶noun Prosody an arrangement of triplets, especially in iambic pentameter, that rhyme aba bcb cdc etc.
– origin Ital., lit. ‘third rhyme’.
'terza rima' also found in these Oxford entries:

