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.
People. 1  Draco (lawgiver) (from Greek: Î´ÏÎ¬ÎºÏÎ½), the first lawgiver of ancient Athens, Greece, from whom the term draconian is derived. 2  Draco (physician) (from Greek: Î´ÏÎ¬ÎºÏÎ½), the name of several physicians in the family of Hippocrates. 3  Draco Rosa, a Puerto Rican songwriter and former member of Puerto Rican boy band Menudo.