Where does “white coat effect” come from?

white coat effect (English) comes from English effect, from Middle English effect, from Old French effect, from Latin effectus, from Latin efficiō, from Latin ex, from Latin commūnicō, from Latin commūnis — whale, sea monster; abyss.

Ancestry of “white coat effect”, step by step

white coat effect traces back through two separate lines of ancestry.

via English effect

Step	Language	Word	Meaning
1	English	effect	The result or outcome of a cause; Impression left...
2	Middle English	effect	—
3	Old French	effect	effect; judgment; decree
4	Latin	effectus	made out, worked out, completed, finished,...
5	Latin	efficiō	to make out or work out; effect, execute, complete, accomplish, make, form, compose
6	Latin	ex	A name of the letter "X"; out of, from
7	Latin	commūnicō	to impart, share
8	Latin	commūnis	common, commonplace, ordinary, general, universal, shared, shared alike, of both sides, belonging to two or more together
9	Old Latin	com(m)oinis	—
10	Proto-Italic	kommoinis	common
11	Proto-Indo-European	ḱom-moy-ni-	held in common
12	Proto-Indo-European	ḱóm	beside, near, by, with
13	Proto-Indo-European	ḱe	Deictic particle, here; Post-positional...
14	Middle English	kyt	—
15	Russian	кит	whale; genitive plural of ки́та
16	Old Church Slavonic	китъ	whale
17	Ancient Greek	κῆτος	whale, sea monster; abyss

via English white coat

Step	Language	Word	Meaning
1	English	white coat	A white, knee-length coat worn by laboratory...

Every word from Ancient Greek κῆτος →Every word from Old Church Slavonic китъ →Every word from Russian кит →