ap·o·them 
(ăpə-thĕm′)
(ăpə-thĕm′)n.
The perpendicular distance from the center of a regular polygon to any of its sides.
[APO- + Greek thema, something laid down; see THEME.]
- hydrocele
- hydrocephalic
- hydrocephaloid
- hydrocephalous
- hydrocephalus
- hydrocephaly
- hydrochloric acid
- hydrochloride
- hydrochlorofluorocarbon
- hydrochlorothiazide
- hydrochore
- hydrochory
- hydrocodone
- hydrocolloid
- hydrocolloidal
- hydrocortisone
- hydrocrack
- hydrocracker
- hydrocracking
- hydrocyanic acid
- hydrodynamic
- hydrodynamical
- hydrodynamically
- hydrodynamicist
- hydrodynamics