Definition of amphioxus in US English:

amphioxus

noun

  • A lancelet that is caught for food in parts of Asia.

    Genus Branchiostoma (formerly Amphioxus), family Branchiostomidae

    • ‘Thus amphioxus is the only chordate species in which distinct insulin and IGF genes have not been found.’
    • ‘For this interesting animal, extensive morphological and developmental biological studies have been conducted, but limited information has been available on endocrinology and physiology of amphioxus.’
    • ‘A few years ago, some molecular embryology data on amphioxus have revived the long forgotten hypothesis that the ancestor of coelomates was a segmented animal.’
    • ‘Organisms along the lines of the cephalochordate amphioxus use the gill apparatus for filter feeding.’
    • ‘The cephalochordate amphioxus is the closest living invertebrate relative of the vertebrates and therefore the best model organism for understanding the composition of the ancestral chordate genome.’

Origin

Mid 19th century: modern Latin, from amphi- + Greek oxus ‘sharp’.

Pronunciation

amphioxus

/ˌamfēˈäksəs//ˌæmfiˈɑksəs/