In identifying humans, it can mean a large nose, a vivid scar, crossed eyes, a tattoo, a missing limb - any number of things which draw first attention when observing someone.
The bug that has a distinctive feature of a tail is a scorpion.
Her big brown eyes were her most distinctive feature. The most distinctive feature of Scandinavian furniture is simple lines and curves. The Eiffel Tower is the most distinctive feature of the Paris landscape.
What do you mean by distinctive? Is that the word you meant?
growth
Horn
The face of the cliff has a distinctive physical feature.
The distinctive feature of a black spider with orange stripes is its unique coloration, which sets it apart from other spiders.
The distinctive feature of a red spider with a yellow back is its unique coloration, which sets it apart from other spiders.
Some breeds of dogs that have tan eyebrows as a distinctive feature include the Rottweiler, Doberman Pinscher, and the Boxer.
A fly with a red abdomen has a distinctive feature of a brightly colored abdomen that sets it apart from other flies.
The horn
The distinctive feature of a gray spider with black stripes is its unique color pattern, which sets it apart from other spiders.