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| cobalt |
a chemical element that has twenty-seven protons in each nucleus and occurs as a brittle silver-white solid metal, used in a variety of alloys to increase hardness. (symbol: Co) |
| Colorado |
a western U.S. state bordered by Wyoming, Kansas, New Mexico, and Utah. (abbr.: CO) [1/2 definitions] |
| comorbid |
of or pertaining to co-existing medical conditions in a patient. |
| comorbidity |
the presence of co-exisiting medical conditions in a patient. |
| Covid-19 |
a serious, potentially fatal disease caused by a novel coronavirus that broke out initially in 2019 and caused a pandemic in 2020. "Co" in Covid stands for "corona," "vi" stands for "virus," and "d" stands for "disease." The number 19 refers to the year 2019. |
| Meriwether Lewis |
U.S. co-leader with William Clark of an expedition to explore the uncharted American West, from Missouri to Oregon, from 1804 to 1807 (b.1774--d.1809). |
| William Clark |
U.S. co-leader with Meriwether Lewis of an expedition to explore the uncharted American West, from Missouri to Oregon, from 1804 to 1807 (b.1770--d.1838). |
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