Aberrant
Aberrant ({not transcribed}) , adjective
[Latin aberrans, -rantis, present participle of aberrare. See Aberr.]
1.
Wandering; straying from the right way.
2.
(Biology) Deviating from the ordinary or natural type; exceptional; abnormal.
The more aberrant any form is, the greater must have been the number of connecting forms which, on my theory, have been exterminated.