1. Plural of acantha; spiny or prickly structures, especially in botany and zoology.
Usage: technical; plural form; used in botanical and biological contexts
2. In architecture, ornamental leaf-like projections resembling acanthus leaves, used as decorative elements.
Usage: architectural; plural form; historical

Examples

• The plant's acanthae protect it from herbivores.
• Botanists examined the acanthae under the microscope.
• The column was decorated with carved acanthae in the classical style.
• The sea urchin's acanthae serve both defensive and locomotor functions.
• Medieval architects incorporated acanthae into their ornamental designs.