Where does “ultramicrotomy” come from?

ultramicrotomy (English) comes from English microtomy, from English micro-, from Ancient Greek μικρο-, from Ancient Greek μικρός, from Proto-Indo-European mēy- — soft, tender, dear.

ultramicrotomy (English): microtomy using an ultramicrotome

Definitions

microtomy using an ultramicrotome

Ancestry of “ultramicrotomy”, step by step

ultramicrotomy traces back through two separate lines of ancestry.

via English microtomy

Step	Language	Word	Meaning
1	English	microtomy	The preparation of very thin slices of animal or...
2	English	micro-	API; Very small; One millionth
3	Ancient Greek	μικρο-	micro
4	Ancient Greek	μικρός	little, small
5	Proto-Indo-European	mēy-	soft, tender, dear

via English ultra

Step	Language	Word	Meaning
1	English	ultra	Extreme; far beyond the norm; fanatical;...
2	Latin	ultrā	beyond
3	Latin	-a	suffixed to the roots of verbs, forms agent...
4	Proto-Italic	-ā	Forms masculine agent nouns from prefixed or compounded bases
5	Proto-Indo-European	-éh₂	—

Words derived from “ultramicrotomy”

cryoultramicrotomy

Every word from Proto-Indo-European mēy- →Every word from Ancient Greek μικρός →Every word from English micro- →