Definition of Hemichordata in English:

Hemichordata

plural noun

Zoology
  • A small phylum of marine invertebrates that comprises the acorn worms.

    • ‘Deuterostomia are a major group of metazoans composed of three phyla: Chordata, Hemichordata, and Echinodermata.’
    • ‘Metamorphosis in the acorn worms (Hemichordata, Enteropneusta) includes retention of the entire larval body, which sheds feeding and propulsory cilia and undergoes definitive shape changes.’
    • ‘Another of Ax's hypotheses concerns the Hemichordata.’
    • ‘The superphyla Deuterostomia (e.g., Chordata, Echinodermata, Hemichordata) and Protostomia each appear to have evolved from an ancestor with a coelomic body cavity.’
    • ‘The superphylum Deuterostomia contains the diverse phyla Chordata and Echinodermata and the minor phyla Hemichordata and Urochordata.’

Origin

Modern Latin (see hemi-, Chordata).

Pronunciation:

Hemichordata

/ˌhɛmɪkɔːˈdeɪtə/