Where does “Tast” come from?

Tast (Luxembourgish) comes from German taste, from Italian tasto, from Italian tastare, from Vulgar Latin tastare, from Latin taxāre, from Latin Taxus, from Ancient Greek εἶδος, from Spanish -scopio — to see, to look, to observe.

Tast (Luxembourgish): key, button

Definitions

key, button

Ancestry of “Tast”, step by step

Step	Language	Word	Meaning
1	German	taste	inflection of tasten: ## first-person singular...
2	Italian	tasto	key, button; touch, feel; fret, fingerboard
3	Italian	tastare	to feel, grope, cop a feel; to probe
4	Vulgar Latin	tastare	to touch, feel; present active infinitive of...
5	Latin	taxāre	—
6	Latin	Taxus	yew
7	Ancient Greek	εἶδος	That which is seen: form, image, shape;...
8	Spanish	-scopio	-scope
9	Latin	-scopium	—
10	Ancient Greek	σκοπέω	I look, look at, behold; I examine, inspect; 413...
11	Ancient Greek	σκοπός	watcher, lookout; protector, guardian; spy, scout
12	Ancient Greek	σκέπτομαι	I look at, examine; I examine, consider, think
13	Proto-Hellenic	sképťomai	to look at
14	Proto-Indo-European	spéḱyeti	to be looking at, to keep looking at
15	Proto-Indo-European	speḱ-	to see, to look, to observe

Every word from Proto-Indo-European speḱ- →