CRAB'S Eyes, in pharmacy, are a strong concretion in the head of the cray-fish. They are rounded on one side, and depressed and sinuated on the other, considerably heavy, moderately hard, and without smell. We have them from Holland, Muscovy, Poland, Denmark, Sweden, and many other places.
Crab's eyes are much used both in the shop-medicines and extemporaneous prescriptions, being accounted not only absorbent and drying, but also diuretic.