obsolete

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obsolete

Biology (of parts, organs, etc.) vestigial; rudimentary

obsolete

[‚äb·sə′lēt]
(biology)
A part of an organism that is imperfect or indistinct, compared with a corresponding part of similar organisms.
(engineering)
No longer satisfactory for the purpose for which obtained, due to improvements or revised requirements.
References in classic literature ?
He who first opens Chaucer, or any other ancient poet, is so much struck with the obsolete spelling, multiplied consonants, and antiquated appearance of the language, that he is apt to lay the work down in despair, as encrusted too deep with the rust of antiquity, to permit his judging of its merits or tasting its beauties.
From time to time I dipped into old Sir Thomas Malory's enchanting book, and fed at its rich feast of prodigies and adventures, breathed in the fragrance of its obsolete names, and dreamed again.
With respect to walls, those who say that a courageous people ought not to have any, pay too much respect to obsolete notions; particularly as we may see those who pride themselves therein continually confuted by facts.