n (context|biology) A group, individual, or structure that deviates from the usual or natural type, especially with an atypical chromosone number.
a (obsolete) Differing from the norm. (defdate|Attesting from the mid 16th century until the early 17th century.)(reference-book | last =| first = | authorlink = | coauthors = | editor =Brown, Lesley | others = | title = The Shorter Oxford English Dictionary | origdate = | origyear = 1933| origmonth = | url = | format = | accessdate = | accessyear = | accessmonth = | edition = 5th | date = | year =2003| month = | publisher =Oxford University Press | location =Oxford, UK | language = | id = | doi = | isbn =978-0-19-860575-7 | lccn = | ol = | pages =4| chapter = | chapterurl = | quote =)
a (literal|figuratively) Straying from the right way; deviating from morality or truth. (defdate|First attested in the mid 18th century.)