Shakespeare said it best when he ruminated on what's in a name, but the truth of the matter is that styles change with the fashion times, and pj's haven't escaped that inevitable evolution.
The kernel consists mainly of the abundant endosperm, which is firm, whitish in colour and marbled with numerous reddish-brown vein-like partitions, into which the inner seedcoat penetrates, forming what is known botanically as ruminated endosperm.