n. [ NL., fr. Gr. &unr_; long. ] (Pron.) A short, straight, horizontal mark [ - ], placed over vowels to denote that they are to be pronounced with a long sound; as, ā, in dāme; ē, in sēam, etc. Syn. -- macrotone. [ 1913 Webster ]
[ちょうおんぷ, chouonpu](n) katakana-hiragana prolonged sound mark; macron (indicating a long vowel); circumflex (indicating a long vowel); modifier letter triangular colon (IPA diacritical)[Add to Longdo]