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| a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
norethindrone nor·eth·in·drone (nôr-ěth'ĭn-drōn')
n.
A progestational agent with some estrogenic and androgenic activity that is used as a substitute for progesterone and, in combination with an estrogen, as an oral contraceptive.