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| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
sea butterfly
small marine gastropods of the subclass Opisthobranchia having a pair of winglike flaps (parapodia) that are used for swimming. These gastropods were once grouped as the order Pteropoda. They live at or near the sea surface; most are less than 1 cm (0.4 inch) long.
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