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.
The meaning of this name is not known for certain ... [more]. DRACO m Ancient Greek (Latinized). From the Greek name Î´ÏÎ±ÎºÏÎ½ (Drakon) which meant dragon, serpent ... [more]. DRAKE m English. From an English surname derived from the Old Norse given name Draki or the Old English given name Draca both meaning dragon ...