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Orontes
oropendola
oropharynx
orotund
Oroya fever
orphan
orphan assets
orphan site
orphanage
orpharion
Orpheus
Orphic
Orphism
orphrey
orpiment
orpine
Orpington
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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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