Where does “batypelagial” come from?

batypelagial (Polish) comes from Polish pelagial, from French pélagial, from Latin pelagicus, from Ancient Greek πελαγικός, from Ancient Greek -ικός, from Ancient Greek -κός, from Proto-Indo-European -ḱos — -y, -ic.

batypelagial (Polish): bathypelagic zone

Definitions

bathypelagic zone

Ancestry of “batypelagial”, step by step

Step	Language	Word	Meaning
1	Polish	pelagial	pelagic zone
2	French	pélagial	—
3	Latin	pelagicus	pelagic
4	Ancient Greek	πελαγικός	—
5	Ancient Greek	-ικός	of or pertaining to, in the manner of; -ic
6	Ancient Greek	-κός	forms adjectives with the sense of 'of or...
7	Proto-Indo-European	-ḱos	-y, -ic

Every word from Proto-Indo-European -ḱos →Every word from Ancient Greek -ικός →Every word from Ancient Greek -κός →