Asdicn.
/ˈazdɪk/, U.S. /ˈæzˌdɪk/ An echo-sounding device for the detection of submarines. Cf. sonar n.
ΘΚΠ
the mind > attention and judgement > discovery > instrument for detection > [noun] > location by echo > device for
echo-sounder1927
Asdic1939
1939 War Illustr. 29 Dec. 538/2 Asdic..mentioned by Mr. Churchill in one of his speeches..[is] a type of secret apparatus now used by the Navy.
1940 Nature 3 Aug. 171/1 On May 21, Dr. R. W. Boyle received the Flavelle Medal of the Society..in recognition of his researches, particularly on the development of ‘Asdics’ and his work on ultrasonics.
1943 Penguin New Writing 18 27 Taff is an Asdic rating. They work with headphones and they pick up echoes underwater and can get the bearing and distance of the echo and often they can tell if it's a sub or not.
1952 J. V. Noel Naval Terms Dict. 13 Asdic, British echo-ranging sound gear, equivalent to our [sc. American] Sonar.
1958 Spectator 8 Aug. 196/2 asdic, the device which sends out pulses of sound through the sea and records the echo where these are reflected back from a submarine.
This entry has not yet been fully updated (first published 1972; most recently modified version published online December 2021).
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n.1939