Best Answer: Heather gave you the correct answer. It stands for jumper due to the initials PJ on the old flight logs. However, today we only use the nickname PJ and the term Pararescuemen or Pararescueman to describe us.Pararescue Jumper is defunct. Yes, PJs actually jump. All PJs are basic airborne qualified and military free fall (HALO) qualified.he J stands for Jumper as in Air Force Pararescue Jumper. The term Pararescue Jumper is a retronym of the initials 'PJ' that were used on an Air Force Form 5 (Aircrew Flight Log) to identify anyone who is onboard in order to jump from the aircraft..
Definition of VIRION. : a complete virus particle that consists of an RNA or DNA core with a protein coat sometimes with external envelopes and that is the extracellular infective form of a virus.ADVERTISEMENT. French, from viri en viral (from virus virus) + -on 2 -on.First Known Use: 1959.edical Definition of VIRION. : a complete virus particle that consists of an RNA or DNA core with a protein coat sometimes with external envelopes and that is the extracellular infective form of a virus. Britannica.com: Encyclopedia article about virion.
Definition. Viral protein part of the virion tail sheath of prokaryotic viruses. The tail sheath is an external contractile envelope wrapping the internal tail tube in some viruses (e.g. Myoviridae).efinition. Viral protein part of the virion tail sheath of prokaryotic viruses. The tail sheath is an external contractile envelope wrapping the internal tail tube in some viruses (e.g. Myoviridae).