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Orpington
orrery
orris
orrisroot
ort
ortanique
orth.
ortho-
orthocenter
orthochromatic
orthoclase
orthodontics
Orthodox
orthodox
Orthodox Church
Orthodox Judaism
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orthocenter
or·tho·cen·ter [ áwrthō sèntər ] (plural or·tho·cen·ters)


noun 
Definition:
 
point where altitudes of triangle intersect: the point at which the three altitudes of a triangle intersect
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