aboral
adj. C1 Advanced ab·o·ral
adj. describing the side of an animal that is opposite to where it attaches to the ground or a surface. It is the part of the body that faces upward or away from the bottom.
adj. relating to the side of an organism that is opposite to the side attached to a substrate or the ground. In echinoderms, it refers to the upper surface relative to the oral surface.
The sea star has a rough aboral surface.
Biologists observed that the aboral side of the creature was covered in small, protective spines.
The aboral surface of the echinoderm is typically more complex and textured than the oral side, which is adapted for feeding and sensory perception.
From ab- (“away from”) + oral (“the mouth”).