WordReference Random House Unabridged Dictionary of American English © 2026
Sr, [Symbol, Chem.]
  1. Chemistrystrontium.

sr, 
  1. steradian.

Sr., 
    1. Senhor.
    2. Senior.
    3. Señor.
    4. Sir.
    5. [Eccles.]Sister. [ L Soror]

S.R., 
  1. Sons of the Revolution.

Collins Concise English Dictionary © HarperCollins Publishers::
Sr abbreviation for
  1. (after a name) senior
  2. Señor
  3. Sir
  4. Sister (religious)
 the chemical symbol for
  1. strontium
WordReference Random House Learner's Dictionary of American English © 2026
Sr.,  an abbreviation of:
  1. Senior.
  2. Señor.
  3. Sir.
  4. Sister.

Collins Concise English Dictionary © HarperCollins Publishers::
sr symbol for
  1. steradian
'Sr' also found in these entries (note: many are not synonyms or translations):
rubidium-strontium dating - Senior - steradian - strontium - cousin - December - phonotactic - senhor - señor - strontium hydroxide

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