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ra    音标拼音: [r'ɑ]
n. [埃及神话] 太阳神

[埃及神话] 太阳神

Ra
n 1: an intensely radioactive metallic element that occurs in
minute amounts in uranium ores [synonym: {radium}, {Ra},
{atomic number 88}]
2: ancient Egyptian sun god with the head of a hawk; a universal
creator; he merged with the god Amen as Amen-Ra to become the
king of the gods [synonym: {Ra}, {Re}]
3: (astronomy) the equatorial coordinate specifying the angle,
measured eastward along the celestial equator, from the
vernal equinox to the intersection of the hour circle that
passes through an object in the sky; usually expressed in
hours and minutes and seconds; used with declination to
specify positions on the celestial sphere; "one hour of right
ascension equals fifteen degrees" [synonym: {right ascension},
{RA}, {celestial longitude}]

Ra \Ra\ (r[aum]), n.
A roe; a deer. [Obs.] --Chaucer.
[1913 Webster]


Ra- \Ra-\
A prefix, from the Latin re and ad combined, coming to us
through the French and Italian. See {Re-}, and {Ad-}.
[1913 Webster]

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  • Rheumatoid arthritis - Symptoms and causes - Mayo Clinic
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    Learn about rheumatoid arthritis, including how it is diagnosed and treated, and tips for living with the condition
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    What is rheumatoid arthritis? It is a disease that affects multiple joints, resulting in pain, swelling, and stiffness Tiredness and fever may also be present
  • Radium ra 223 dichloride (intravenous route) - Mayo Clinic
    Radium Ra 223 dichloride injection is used to treat men with castration-resistant (resistant to medical or surgical treatments to lower testosterone) prostate cancer that has spread to the bones but not to other organs It is a radiopharmaceutical agent Radiopharmaceuticals are radioactive agents that are used to find and treat certain diseases
  • Osteoarthritis versus rheumatoid arthritis - Mayo Clinic
    Osteoarthritis, the most common form of arthritis, involves the wearing away of the cartilage that caps the bones in the joints Rheumatoid arthritis is a condition in which the immune system attacks the joints, beginning with the lining of joints





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