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  2. Rheumatoid arthritis - Wikipedia

    en.wikipedia.org/wiki/Rheumatoid_arthritis

    Rheumatoid arthritis (RA) is a long-term autoimmune disorder that primarily affects joints. [1] It typically results in warm, swollen, and painful joints. [1] Pain and stiffness often worsen following rest. [1] Most commonly, the wrist and hands are involved, with the same joints typically involved on both sides of the body. [1]

  3. Ra - Wikipedia

    en.wikipedia.org/wiki/Ra

    Ra was portrayed as a falcon and shared characteristics with the sky-god Horus. At times, the two deities were merged as Ra-Horakhty, "Ra, who is Horus of the Two Horizons". When the god Amun rose to prominence during Egypt's New Kingdom, he was fused with Ra as Amun-Ra.

  4. List of medical abbreviations: R - Wikipedia

    en.wikipedia.org/wiki/List_of_medical...

    Meaning R: respiration, (right) RA: refractory anemia rheumatoid arthritis right atrium room air RAD: reflex anal dilatation right axis deviation reactive airway disease radiation absorbed dose reactive attachment disorder: Rad hys: radical hysterectomy: RAE: right atrial enlargement RAI: radioactive iodine: RAIU: thyroid reactive iodine uptake ...

  5. Right ascension - Wikipedia

    en.wikipedia.org/wiki/Right_ascension

    Right ascension (abbreviated RA; symbol α) is the angular distance of a particular point measured eastward along the celestial equator from the Sun at the March equinox to the (hour circle of the) point in question above the Earth. [1]

  6. Surface roughness - Wikipedia

    en.wikipedia.org/wiki/Surface_roughness

    The standard is based on the ″M″ (mean line) system. There are many different roughness parameters in use, but R a {\displaystyle Ra} is by far the most common, though this is often for historical reasons and not for particular merit, as the early roughness meters could only measure R a {\displaystyle Ra} .

  7. Return merchandise authorization - Wikipedia

    en.wikipedia.org/wiki/Return_merchandise...

    A return merchandise authorization (RMA), return authorization (RA) or return goods authorization (RGA) is a part of the process of returning a product to receive a refund, replacement, or repair to which buyer and seller agree during the product's warranty period.

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