Definition

Noun: 1. A distinct, often physically connected, individual animal that is part of a colonial organism. A zooid is a single, usually physically dependent, unit within a colony of animals. It is typically specialized for a specific function (like feeding, reproduction, or defense) and cannot survive independently. This term is primarily used in zoology for colonial animals like bryozoans, hydrozoans, and some tunicates.

Usage Examples

• Noun:
  • Each feeding zooid in the bryozoan colony has a crown of tentacles called a lophophore.
  • The colonial siphonophore is composed of many specialized zooids, some for swimming and others for capturing prey.
  • Biologists study how zooids communicate and coordinate within the larger colonial structure.

Advanced Usage

• Autozooid: A feeding zooid, responsible for nutrient intake for the colony.
  • The autozooids are the most numerous type in the bryozoan colony.
• Heterozooid: A zooid specialized for a non-feeding function, such as reproduction (gonozooid), defense (avicularium), or structural support.
  • The avicularium, a defensive heterozooid, resembles a bird's beak and deters predators.

Variants and Related Words

• Zooidal (adj): Of or relating to a zooid.
  • The zooidal arrangement is crucial for the colony's efficiency.
• Polyzooid: An individual zooid within a bryozoan colony (a more specific term).
• Hydranth: The feeding zooid of a hydrozoan colony.

Synonyms

• Polyp (specifically for some cnidarian colonies like corals and hydrozoans).
• Individual (in a biological, colonial context).
• Zoid (a less common variant).

Notes on Different Meanings

The term "zooid" is highly specialized in biological sciences. It does not have common idiomatic or phrasal verb uses. Its primary and almost exclusive meaning relates to colonial animal biology.

Noun

1. one of the distinct individuals forming a colonial animal such as a bryozoan or hydrozoan