name, noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   Initialism of recommended human dose. abbreviation, alt-of, countable, initialism, uncountable
2. 2
   Rhesus factor D, an antigen in the Rhesus system.
3. 3
   Initialism of rheumatic heart disease. abbreviation, alt-of, countable, initialism, uncountable
4. 4
   Initialism of right-hand drive. abbreviation, alt-of, countable, initialism, uncountable

Proper Noun

1. 1
   Initialism of Robbery Homicide Division (U.S. TV series). abbreviation, alt-of, initialism
2. 2
   Initialism of Random House Dictionary of the English Language. abbreviation, alt-of, initialism

Synonyms

All synonyms

red hand defendersright-hand drive

Etymology

From Rh, abbreviation of Rhesus, and D, a sequential alphabetic designator.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.