orthographic (also orthographical)

adj.

ormolu, ornament, ornamental, ornamentation, ornate, ornately, ornateness, ornithological, ornithologist, ornithology, orotund, orphan, orphanage, orris-root, orth(o)-, orthodontic, orthodontics, orthodontist, orthodox, orthodoxy, orthographically, orthography, orthopaedic (also orthopedic), orthopaedics (also orthopedics), orthopaedist (also orthopedist), ortolan, oryx, OS, Oscar, oscillate, oscillation, oscillator, oscillograph, oscilloscope, osier, osmosis, osmotic, osprey, osseous, ossification,