The Collaborative International Dictionary
Brachylogy
Brachylogy \Bra*chyl"o*gy\, n. [Gr. ? : brachy`s short + ? discourse: cf. F. brachylogie.] (Rhet.) Conciseness of expression; brevity.
Wiktionary
brachylogy
n. 1 concise speech; laconism 2 (context rhetoric English) Any of several forms of omission of words, including the omission of an understood part of a phrase, as, the omission of "good" from "(good) morning!" (brachyology).