| first pass v. |
see under angiocardiography.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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|---|---|
| first s. |
the heart sound occurring during closure of the mitral and tricuspid valves; it is dull, firm, prolonged, and is heard as a “lubb” sound. It begins with an inaudible, low-frequency vibration (M) occurring at the onset of ventricular systole, followed by two intense, high-frequency vibratory bursts associated with mitral and tricuspid valve closure (M1 and T1, respectively), and ending with several variable low-intensity vibrations. Splitting of M1 and T1 is not usually discernible in normal adults. Abbreviated S1.
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| first s. of labor |
the earliest stage of labor, ending with dilatation of the os uteri.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| first t. |
hallux.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| first thoracic g. |
a portion of the ganglion cervicothoracicum, present sometimes as a separate ganglion.
출처: www.mercksource.com/pp/us/cns/cns_health_library.j...
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| FIR | ranking above all others |
|---|---|
| FIR | serving to begin |
| FIR | serving to set in motion |
| FIR | preceding all others in time or space or degree |
| FIR | (music) highest in pitch or chief among parts or voices or instruments or orchestra sections |
| FIR | indicating the beginning unit in a series |
| FIR | before anything else |
| FIR | the initial time |
| FIR | prominently forward |
| FIR | before another in time, space, or importance |
| FIR | emergency care given before regular medical aid can be obtained |
| FIR | an amendment to the Constitution of the United States guaranteeing the right of free expression |