Doppler ultrasound is a type of ultrasound that depends on the Doppler Effect, a change in the wave's frequency, which can occur from the motion of a reflector, such a red blood cell. We experience the Doppler Effect when, for example, an ambulance approaches us, passes and then drives away.
Definition of PLACODERM. : any of a class (Placodermi) of extinct chiefly Devonian fishes with an armor of bony plates and primitive jaw structures.ADVERTISEMENT. New Latin Placodermi, ultimately from GK plak-, plax + derma skin â more at derm-. any of a class (Placodermi) of extinct chiefly Devonian fishes with an armor of bony plates and primitive jaw structures. ADVERTISEMENT.
Genus. Varanus. The Komodo dragon (Varanus komodoensis) is the largest lizard in the world, and with its ancient appearance and evocative name, the Komodo conjures up the stuff of legends. The heavy-set body of the Komodo dragon is long with stocky legs and a long muscular tail; the scaly skin is greyish-brown all over.