noun
eyestalk; optic stalk
Zoological term for the movable stalk that bears an eye, found in crustaceans such as crabs and shrimps.
カニの眼柄は自由に動かせる。
A crab's eyestalks can move freely.
エビの眼柄を切除すると脱皮が促進されることが知られている。
It is known that removing the eyestalks of shrimp promotes molting.