Primordial

Meaning

Adj

●

first,

or original

●

In Biology:

characteristic of the

of the development of an

, or

to a primordium

●

primeval

●

Of

an

element

or

isotope:

occurring

primordially

(on

Earth)

(i.e.

inherited

from

when

the

Earth

was

formed);

because

it

is

stable,

or

radioactive

but

so

long-lived

that

some

is

left

over

from

when

the

Earth

was

formed.

For

example,

primordial

radioisotopes

(T

=

half-life)

include

uranium-235

(T

=

7×10⁸

years),

potassium-40

(T

=

1.25×10⁹

years),

uranium-238

(T

=

4.5×10⁹

years),

and

thorium-235

(T

=

1.4×10¹⁰

years).

Noun

●

A

first principle

or element.

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