| or | | |
| n. (location) | 1. beaver state, or, oregon | a state in northwestern United States on the Pacific. |
| ~ pacific northwest | a region of the northwestern United States usually including Washington and Oregon and sometimes southwestern British Columbia. |
| ~ crater lake national park | a national park in Oregon having the deepest lake in the United States in the crater of an extinct volcano. |
| ~ american state | one of the 50 states of the United States. |
| ~ america, the states, u.s.a., united states, united states of america, us, usa, u.s. | North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776. |
| ~ bend | a town in central Oregon at the eastern foot of the Cascade Range. |
| ~ eugene | a city in western Oregon on the Willamette River; site of a university. |
| ~ klamath falls | a town in southern Oregon near the California border. |
| ~ medford | a town in southwestern Oregon; a summer resort. |
| ~ portland | freshwater port and largest city in Oregon; located in northwestern Oregon on the Willamette River which divides the city into east and west sections; renowned for its beautiful natural setting among the mountains. |
| ~ capital of oregon, salem | capital of the state of Oregon in the northwestern part of the state on the Willamette River. |
| ~ klamath, klamath river | a river flowing southwest from Oregon through northern California to the Pacific Ocean. |
| ~ snake river, snake | a tributary of the Columbia River that rises in Wyoming and flows westward; discovered in 1805 by the Lewis and Clark Expedition. |
| ~ willamette, willamette river | a river in western Oregon that flows north into the Columbia River near Portland. |
| n. (artifact) | 2. operating room, operating theater, operating theatre, or, surgery | a room in a hospital equipped for the performance of surgical operations.; "great care is taken to keep the operating rooms aseptic" |
| ~ hospital room | a room in a hospital for the care of patients. |
| o | | |
| n. (substance) | 1. atomic number 8, o, oxygen | a nonmetallic bivalent element that is normally a colorless odorless tasteless nonflammable diatomic gas; constitutes 21 percent of the atmosphere by volume; the most abundant element in the earth's crust. |
| ~ chemical element, element | any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter. |
| ~ liquid oxygen, lox | a bluish translucent magnetic liquid obtained by compressing gaseous oxygen and then cooling it below its boiling point; used as an oxidizer in rocket propellants. |
| ~ air | a mixture of gases (especially oxygen) required for breathing; the stuff that the wind consists of.; "air pollution"; "a smell of chemicals in the air"; "open a window and let in some air"; "I need some fresh air" |
| ~ h2o, water | binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent. |
| ~ gas | a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely. |
| ~ ozone | a colorless gas (O3) soluble in alkalis and cold water; a strong oxidizing agent; can be produced by electric discharge in oxygen or by the action of ultraviolet radiation on oxygen in the stratosphere (where it acts as a screen for ultraviolet radiation). |
| n. (communication) | 2. o | the 15th letter of the Roman alphabet. |
| ~ latin alphabet, roman alphabet | the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe. |
| ~ alphabetic character, letter of the alphabet, letter | the conventional characters of the alphabet used to represent speech.; "his grandmother taught him his letters" |
| n. (body) | 3. group o, o, type o | the blood group whose red cells carry neither the A nor B antigens.; "people with type O blood are universal donors" |
| ~ blood group, blood type | human blood cells (usually just the red blood cells) that have the same antigens. |
| yes | | |
| n. (communication) | 1. yes | an affirmative.; "I was hoping for a yes" |
| ~ affirmative | a reply of affirmation.; "he answered in the affirmative" |
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