echinate

/ˈɛkɪneɪt/
adjective
  1. Covered with spines, prickles, or bristles.
    • Some caterpillars have an echinate appearance to deter birds.
    • The echinate surface of the sea urchin protects it from predators.
    • The botanist described the plant's stem as echinate due to its many sharp hairs.
Antonyms