anechoicadj.
/ˌanᵻˈkəʊɪk/, /ˌanɛˈkəʊɪk/, U.S. /ˌænəˈkoʊɪk/ 1.
a. Of a room or chamber: designed so that the reflection of sound or (in later use) electromagnetic waves within the room is minimized.Anechoic chambers are also typically designed to block external sound or electromagnetic radiation.
ΘΚΠ
the world > physical sensation > hearing and noise > degree, kind, or quality of sound > non-resonance > [adjective] > without echo
echoless1798
unechoing1817
anechoic1946
1946 Jrnl. Franklin Inst. 241 388 One portion of the laboratory's work demanded the construction of a special room called an ‘Anechoic Chamber’.
1982 IEEE Trans. Nucl. Sci. 29 1610/2 The chamber is placed in an anechoic room made up of microwave absorbers.
2005 Guardian 11 Aug. (Life section) 9/2 As I step out of the anechoic chamber and back into the control room, my sensory deprivation ends.
b. Of a material or structural element: designed to absorb sound or (in later use) electromagnetic waves.
ΘΚΠ
society > occupation and work > materials > types of material generally > [adjective] > other types
statuable1636
statutablea1661
rot-proof1849
commercialc1865
machinable1897
anechoic1956
1956 Industr. Res. Lab. U.S. (ed. 10) (National Acad. Sci.-National Res. Council) 314/1 Research activities:..electronic subjects such as microwave absorbers, anechoic materials,..and teletype devices.
2002 S. Coonts America i. 18 The tug's stern gently contacted the anechoic skin of the submarine below the waterline.
2. Radiology. Of a substance or anatomical structure or area: that reflects few (if any) ultrasound waves, thus producing a dark region in an ultrasound image.
ΚΠ
1969 Amer. Jrnl. Roentgenol. 105 442/1 (caption) This cross section composite taken at 15 cm. above the iliac crest (high in the abdomen) demonstrates a large anechoic area..which may or may not be a mass.
2004 A. T. Stavros Breast Ultrasound x. 329/1 The more fluid and the more acute the obstruction, the more likely a sebaceous cyst is to appear anechoic or nearly anechoic.
This entry has been updated (OED Third Edition, March 2020; most recently modified version published online December 2021).
<
adj.1946