quword
趣词
Word Origins Dictionary
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
ultrasonic (adj.)
"having frequency beyond the audible range," 1923, from
ultra-
+
sonic
. For sense, see
supersonic
.