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.
This is a wonderful name for Harry Potterâs antagonist at Hogwarts. Itâs also a fine example of a characteronym, a name that gives an impression or feeling close to who it is attached to. The origin of the name should be clear. Draco is Latin for dragon, ultimately from the ancient Greek drakÅn, meaning serpent. Draco is also the name of a constellation of stars, and of the first lawgiver in ancient Athens, which is where we got the word draconian from.