pentalogy /pen-talˈə-ji/

1. A pentad, esp of published works
2. A series of five related books

• orthodromic
• orthodromics
• orthodromies
• orthodromy
• orthoepic
• orthoepical
• orthoepies
• orthoepist
• orthoepists
• orthoepy
• orthogeneses
• orthogenesis
• orthogenesist
• orthogenesists
• orthogenetic
• orthogenetically
• orthogenic
• orthogenics
• orthognathic
• orthognathism
• orthognathisms
• orthognathous
• orthogonal
• orthogonality
• orthogonally