Old serum Synonyms

Old replaced

Definitions for Old


  • (adjective) being of advanced years and especially past middle age
  • (adjective) dating or surviving from the distant past
  • (adjective) having been such at some previous time

Synonyms for phrase

OS abbreviation

OS is an abbreviation for Old Serum
What does OS stand for?
OS stands for "Old Serum"

Serum replaced

Definitions for Serum


  • (noun) an amber, watery fluid , rich in proteins, that separates out when blood coagulates