Online English 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
Home
coelostat
n.
an optical instrument used to follow the path of a celestial body and reflect its light into a telescope; it has a movable and a fixed mirror.
© 2009
Dammam Community College