Not synchronous; multiple separate occurrences, such as multiple primary cancers developing at intervals. ... Origin: meta-+ G. Chronos, time ... (05 Mar 2000) ... 
(mә-tak´rә-nәs) term used in oncology to refer to neoplasms that develop later in patients who have had a previous tumor. See also asynchronous.
Type: Term Pronunciation: mĕ-tak′rō-nŭs Definitions: 1. Not synchronous; multiple separate occurrences, such as multiple primary cancers developing at intervals.
metachronous 1. Not synchronous; multiple separate occurrences, such as multiple primary cancers developing at intervals. 2. Occurring at different times.