Where does “metenkephalin” come from?

metenkephalin (English) comes from English enkephalin, from Ancient Greek ἐγκέφαλος, from Ancient Greek κεφαλή, from Latin Taxus, from Ancient Greek εἶδος, from Spanish -scopio, from Latin -scopium, from Ancient Greek σκοπέω — to see, to look, to observe.

metenkephalin (English): An endogenous opioid peptide neurotransmitter...

Definitions

An endogenous opioid peptide neurotransmitter...

Ancestry of “metenkephalin”, step by step

Step	Language	Word	Meaning
1	English	enkephalin	Any of a group of pentapeptide endorphins that...
2	Ancient Greek	ἐγκέφαλος	inside the head; brain; heart of the date palm
3	Ancient Greek	κεφαλή	head; a person's life; the top-most part
4	Latin	Taxus	yew
5	Ancient Greek	εἶδος	That which is seen: form, image, shape;...
6	Spanish	-scopio	-scope
7	Latin	-scopium	—
8	Ancient Greek	σκοπέω	I look, look at, behold; I examine, inspect; 413...
9	Ancient Greek	σκοπός	watcher, lookout; protector, guardian; spy, scout
10	Ancient Greek	σκέπτομαι	I look at, examine; I examine, consider, think
11	Proto-Hellenic	sképťomai	to look at
12	Proto-Indo-European	spéḱyeti	to be looking at, to keep looking at
13	Proto-Indo-European	speḱ-	to see, to look, to observe

Every word from Proto-Indo-European speḱ- →