Having eyes that are immobile or fixed in position; unable to move the eyes, used in zoological descriptions of certain organisms.
From Greek 'hedrios' (fixed, seated) plus 'ophthalmos' (eye), a technical zoological term coined for describing structural eye characteristics in organisms like certain crustaceans or fossil creatures.
This bizarre anatomical term describes creatures like some marine arthropods whose eyes are literally locked in place—they have to rotate their entire body to look in different directions.
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