WordReference Random House Unabridged Dictionary of American English © 2026
RH, 
  1. MeteorologySee relative humidity. 
Also, rh 
Rh, [Physiol.]
  1. Chemistry, PhysiologySee Rh factor. 

Rh,  Symbol, Chem.
  1. rhodium.

R.H., 
  1. Royal Highness.

r.h., 
  1. right hand.

Collins Concise English Dictionary © HarperCollins Publishers::
Rh
  1. rhodium
  1. rhesus (esp in Rh factor)
Collins Concise English Dictionary © HarperCollins Publishers::
rh, RH
  1. right hand
'RH' also found in these entries (note: many are not synonyms or translations):
Landsteiner - Rh disease - Rh factor - Rh negative - Rh positive - Rhesus factor - blood group - endorheic - erythroblastosis - positive - relative humidity - rhesus baby - rhesus factor - rho - rhodium

Forum discussions with the word(s) "RH" in the title:


Look up "RH" at Merriam-Webster
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