Orthonectids

Part of speech: noun

Definitions

1. Tiny parasitic marine animals belonging to the phylum Orthonectida, which live inside other sea creatures such as worms and starfish
2. Minute wormlike sea organisms classed in the phylum Orthonectida that inhabit the bodies of various marine invertebrate hosts
3. Microscopic parasites of the ocean placed in the phylum Orthonectida, typically found living within the tissues of certain bottom-dwelling sea animals

Etymology: Orthonectids are tiny parasitic marine animals, and their name is a coinage from Greek roots meaning "straight swimmers": "orthos" (straight, upright) combined with "nektos" (swimming), a reference to the way these creatures move through water. The word belongs to the scientific naming system used for animal groups, which draws on classical Greek and Latin building blocks, so its form reflects a deliberate modern construction rather than an ancient usage. The "-id" ending marks a member of a taxonomic family or group, so "orthonectid" is one individual of the group and "orthonectids" is the plural, referring to the whole class of these organisms. Since the word is a technical term from zoology, it is used mainly in scientific writing and textbooks about invertebrate biology.