វគ្គជំនាញកុំព្យូទ័រ
ចំណេះដឹងទូទៅ
ម្ហូបអាហារ
កំប្លែង
ទស្សន៍ទាយ
តូច
មធ្យម
ធំ
Belemnite
ENGLISH MEANING
noun
1.
A
conical
calcareous
fossil
,
tapering
to a
point
at the
lower
extremity
, with a
conical
cavity
at the
other
end
,
where
it is
ordinarily
broken
;
but
when
perfect
it
contains
a
small
chambered
cone
,
called
the
phragmocone
,
prolonged
, on one
side
,
into
a
delicate
concave
blade
; the
thunderstone
. It is the
internal
shell
of a
cephalopod
related
to the
sepia
, and
belonging
to an
extinct
family
. The belemnites are
found
in
rocks
of the
Jurassic
and
Cretaceous
ages
.