oct

oca

OB o.d. OD OH O.K. OK on OR os OV ox oz.

oaf oak oar OAS oat obi oca odd ode Odo O.E.D. OED off Ofo oft Ohm OIG oil OIS oka ola old olm OMB one ONI Ono ooh Ops opt OPV orb ore Orr otc Oto out owe owl own

octad octadecanoic acid octagon octagonal octahedron octal octal digit octal notation octal number system octal numeration system octameter octane octanedioic acid octane number octane rating octangular Octans octant octave Octavian octavo octet octette octillion October October 12 October 24 Octoberfest October Revolution octogenarian octonary octopod Octopoda Octopodidae octopus octoroon octosyllabic octosyllable octroi octuple