Where does “scaphotrapeziotrapezoid” come from?

scaphotrapeziotrapezoid (English) comes from English trapezoid, from New Latin trapezoides, from Ancient Greek τρᾰπεζοειδής.

scaphotrapeziotrapezoid (English): Of, or relating to the part of the wrist made up of the scaphoid, trapezium, and trapezoid bones on the thumb side

Definitions

Of, or relating to the part of the wrist made up of the scaphoid, trapezium, and trapezoid bones on the thumb side

Ancestry of “scaphotrapeziotrapezoid”, step by step

scaphotrapeziotrapezoid traces back through two separate lines of ancestry.

via English trapezoid

Step	Language	Word	Meaning
1	English	trapezoid	A quadrilateral with two parallel sides; A...
2	New Latin	trapezoides	—
3	Ancient Greek	τρᾰπεζοειδής	—

via English trapezio

Step	Language	Word	Meaning
1	English	trapezio	—

Every word from Ancient Greek τρᾰπεζοειδής →Every word from New Latin trapezoides →Every word from English trapezoid →