retrorse

/rɪˈtrɔrs/
adjective
  1. Bent or pointing backward or downward, especially in biology (e.g., hairs, spines).
    • The plant's stem had retrorse hairs that pointed downward, making it feel rough.
    • Botanists noted the retrorse barbs on the seed pods helped them stick to animal fur.
    • The caterpillar's retrorse spines faced backward, deterring predators from above.
Antonyms
What does "retrorse" mean? | whatsthatwordmean | whatsthatwordmean