|Definition - An obsolete term for what we now call an acronym|
Etymology - The term derives from the Greek protos, first + gramma, letter of the alphabet.
Oxford English Dictionary - Its first citation is from 1924:
"‘Anzac’ is one of the first *protograms to which the war gave birth. It is used … to describe anything pertaining to the ‘Australian and New Zealand Army Corps’."
(Glasgow Herald 27 Sept. 4)