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dodo [dodo 词源字典]: dodo: [17] When Portuguese explorers first encountered the unfortunate dodo on the island of Mauritius, it struck them as a clumsy and foolish bird, so they applied to it the Portuguese word doudo ‘simpleton’. The name has stuck in English (although in the 17th century it had some competition from the French and Dutch term dronte). The first record of the simile ‘dead as a dodo’ comes from 1904, over 200 years after the extinction of the species, although the word had been used since the late 19th century as a metaphor for someone or something hopelessly out of date: ‘He belongs to the Dodo race of real unmitigated toryism’, Lisle Carr, Judith Gwynne 1874.
[dodo etymology, dodo origin, 英语词源]
cockatrice (n.): late 14c., from Old French cocatriz, altered (by influence of coq) from Late Latin *calcatrix, from Latin calcare "to tread" (from calx (1) "heel"), as translation of Greek ikhneumon, literally "tracker, tracer."

In classical writings, an Egyptian animal of some sort, the mortal enemy of the crocodile, which it tracks down and kills. This vague sense became hopelessly confused in the Christian West, and in England the word ended up applied to the equivalent of the basilisk. A serpent hatched from a cock's egg, it was fabled to kill by its glance and could be slain only by tricking it into seeing its own reflection. Belief in them persisted even among the educated because the word was used in the KJV several times to translate a Hebrew word for "serpent." In heraldry, a beast half cock, half serpent.
hopeless (adj.): 1560s, from hope (n.) + -less. Related: Hopelessly; hopelessness.