no longer produced or used; out of date 废止的;过时的 the disposal of old and obsolete machinery. 对陈旧机器的处理。 the phrase was obsolete after 1625. 1625年以后这个短语就废弃不用了。
(Biology)(of a part or characteristic of an organism) less developed than formerly or in a related species; rudimentary; vestigial (生)(生物特征的一部分)废退的,退化的
verb
[with obj.](chiefly US)cause (a product or idea) to be or become obsolete by replacing it with something new (主美)淘汰(产品,想法) we're trying to stimulate the business by obsoleting last year's designs. 我们正设法通过淘汰去年的设计来刺激生意。