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| the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language). |
| an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language. |
| cephalochordate (sěf'ə-lə-kôr'dāt') Pronunciation Key
A member of the subphylum Cephalochordata of the phylum Chordata, whose only living species are the lancelets. See more at lancelet. Compare hemichordate. |
cephalochordate
any member of the subphylum Cephalochordata of the phylum Chordata. Small, fishlike marine invertebrates, they probably are the closest living relatives of the vertebrates. There are about 20 species in two families, each with a single genus. Branchiostoma was formerly called Amphioxus, a name that is retained as an informal term. The other genus is Epigonichthys, also called Asymmetron. The genus Asymmetron is sometimes retained for some species
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