'Silurian period' definitions:
Definition of '
Silurian period
'
From:
WordNet
noun
From 425 million to 405 million years ago; first air- breathing animals [syn:
Silurian
, Silurian period]
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
