ἕδρα
hédra
“seat, base”
9 words in English grow from this root.
Cathedral
Faithκατάkatá
“down-seat, chair”
Chair
Everydayκατάkatá
“a sitting-down place”
Dodecahedron
Numberδώδεκαdṓdeka
“twelve seats”
Ephedrine
Medicineἐπίepí
“sitting upon”
Hexahedron
Numberἕξhéx
“six-seated”
Icosahedron
Numberεἴκοσιeíkosi
“twenty seats”
Octahedron
Numberὀκτώoktṓ
“eight seats”
Polyhedron
Numberπολύςpolýs
“many-seated”
Tetrahedron
Numberτέτρα-tétra-
“four-seated”