acrolect
Concise Oxford English Dictionary © 2008 Oxford University Press:
acrolect /ˈakrə(ʊ)lɛkt/
▶noun Linguistics the most prestigious dialect or variety of a language. Contrasted with basilect.
– derivatives
acrolectal adjective.
acrolectal adjective.
– origin 1960s: from Gk akron ‘summit’ + -lect as in dialect.
'acrolect' also found in these Oxford entries:

