Definition

1. Noun:
   • A sea urchin: In zoology, "echinus" refers to a marine animal of the class Echinoidea, characterized by a globular body enclosed in a spiny shell.
   • An architectural molding: In classical architecture, specifically the Doric order, "echinus" is the convex molding or ovolo situated between the shaft of a column and its abacus.

Usage Examples

• Noun (Zoology):

  • The diver observed a red echinus on the ocean floor.
  • Echini are important grazers in many marine ecosystems.

• Noun (Architecture):

  • The echinus of the Doric column was carved with great precision.
  • The profile of the echinus is a distinctive feature of Greek temples.

Advanced Usage

• Technical/Descriptive: The term is used precisely in specialized fields.
  • The fossil record contains many well-preserved specimens of ancient echini.
  • The architect specified that the echinus must have a pronounced convex curve.

Variants and Related Words

• Echinoidea (n): The scientific class to which sea urchins belong.
• Echinoderm (n): The broader phylum including sea urchins, starfish, and sea cucumbers.
• Ovolo (n): A synonym for the convex architectural molding, often used interchangeably with "echinus" in this context.

Synonyms

• For the animal: Sea urchin.
• For the molding: Ovolo, quarter-round.

Notes on Different Meanings

• The primary distinction is between the biological meaning (a living marine animal) and the architectural meaning (a structural design element). The connection lies in the word's Greek origin meaning "hedgehog" or "sea urchin," describing the spiny animal and, by visual analogy, the rounded, often egg-shaped profile of the molding.

Noun

1. ovolo molding between the shaft and the abacus of a Doric column