in biology
  1. Fluid component of blood in which the blood cells and platelets are suspended. Synonym: blood plasma
  2. Fluid component of semen produced by the accessory glands, the seminal vesicles, the prostate, and the bulbo-urethral glands.
  3. Cell substance outside the nucleus, i.e., the cytoplasm.
PAC, 2004, 76, 1033 (Glossary of terms used in toxicokinetics (IUPAC Recommendations 2003)) on page 1065