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# rh

abbreviation (Rh, RH, rh)

«rh» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

1. Rh (rhesus) factor: a protein that may be on red blood cells; blood is Rh-positive or Rh-negative (as in A+ or O−). [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rh/#m1)
2. RH: short for «right hand», as in music («RH» for the right hand on the piano). [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rh/#m2)
3. RH or rh: short for «relative humidity», how much water vapour is in the air. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rh/#m3)
4. Rh: the chemical symbol for rhodium, a rare metal. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rh/#m4)

### In the lessons

In science and health lessons blood groups have a letter (A, B, AB, O) and a plus or minus sign for Rh. Doctors check Rh before blood transfusions and in pregnancy. In piano music RH and LH tell you which hand plays. Not a word you say; read the letters «R-H» or the full word.

### Examples

- My blood group is O, Rh positive. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rh/#x1)
- Rh-negative blood is less common. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rh/#x2)
- In piano music, RH means play with your right hand. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rh/#x3)
- The weather station shows RH 80%. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rh/#x4)
- Rh is the symbol for the metal rhodium. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rh/#x5)

### Note

An abbreviation, not a word. Say «R-H» or «rhesus». The meaning depends on the subject.

## On Mova

- [Trees and pragmatics of «rh» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/R/rh/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«rh» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/rh.html) on Mova free.