Definition

Noun: A parasitic worm belonging to the phylum Acanthocephala, characterized by living in the intestines of vertebrates and having a retractable, hook-covered proboscis used for attachment to the host's intestinal wall.

Usage

The term "spiny-headed worm" is a common name used in parasitology and zoology to describe these specific intestinal parasites. It is typically used in scientific, veterinary, or educational contexts.

Examples

• The biologist studied the life cycle of the spiny-headed worm found in the fish.
• An infection by a spiny-headed worm can cause significant damage to the host's digestive tract.
• Under the microscope, the spiny-headed worm's proboscis was clearly visible.

Advanced Usage

• The term is often used interchangeably with the taxonomic group name "Acanthocephala" in less formal scientific writing.
  • The phylum Acanthocephala, commonly known as spiny-headed worms, contains several hundred species.

Variants and Related Words

• Acanthocephalan (n.): The formal scientific term for a spiny-headed worm.
  • Acanthocephalans are characterized by their spiny proboscis.
• Proboscis (n.): The elongated, hook-covered feeding and attachment organ that defines these worms.

Synonyms

• Thorny-headed worm (an alternative common name).

Notes on Meaning

The definition refers specifically to the entire organism. The name derives from the distinctive, retractable proboscis (a trunk-like structure) at the worm's anterior end, which is covered in rows of small, recurved hooks or spines that anchor the parasite to the host's intestine.

Noun

1. any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines