Definition of "MR"

MR

proper noun
1. (UK, rail transport) Initialism of Midland Railway.
noun
countable and uncountable, plural MRs
1. Clipping of MRI.
2. (pharmacology, medicine) Initialism of modified release.
  Quotations
  Controlled release (CR), modified release (MR), orally disintegrating tablets (ODT), and other innovative dosage forms are still of interest to both pharmaceutical producers and suppliers.
  2014 April, Ken Seufert, “The New Dawn of Pharmaceutical Manufacturing: Innovative Solutions for Unprecedented Challenges”, in American Pharmaceutical Review, 17(3):8
3. (cardiology) Initialism of mitral regurgitation.
4. (biochemistry) Initialism of mineralocorticoid receptor.
5. (prison system) Initialism of mandatory release.
6. (sports) Initialism of meeting record, the best performance at all occurrences of a particular athletic meeting.
7. (US military) Acronym of memorandum for the record, memorandum for record, memo for the record, or memo for record.
8. (software engineering) Initialism of merge request.
9. (computing) Initialism of mixed reality.
adjective
not comparable
1. (education, special education) Initialism of mentally retarded.