head
From ZooTerms (Dictionary of Invertebrate Zoology)
head (noun; Anglo-Saxon haefod): 1. The anterior body region.
2. (Annelida: Polychaeta) The prostomium and peristomium.
3. (Arthropoda) Bearing the eyes, antennae and mouth parts.
4. (NEMATA) Comprising the lips and sensory organs, oral opening and supporting head skeleton.
