12-Letter Words Starting With O
Here's the list of all the 731 12-Letter Words Starting With O in the English Language.
The list is arranged by the word lengths. Click on the length below to jump to the relevant section of the page.
Common Words (with Definitions and Examples) | |
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organization | 1. a group of people who work together 2. an organized structure for arranging or classifying More Definitions → |
organisation | 1. the persons (or committees or departments etc.) who make up a body for the purpose of administering something 2. a group of people who work together More Definitions → |
optimization | 1. the act of rendering optimal More Definitions → |
occupational | 1. of or relating to the activity or business for which you are trained More Definitions → |
occasionally | 1. sporadically and infrequently More Definitions → |
overwhelming | 1. so strong as to be irresistible 2. very strong; urgently felt More Definitions → |
osteoporosis | 1. abnormal loss of bony tissue resulting in fragile porous bones attributable to a lack of calcium; most common in postmenopausal women More Definitions → |
optimisation | 1. the act of rendering optimal More Definitions → |
oceanography | 1. the branch of science dealing with physical and biological aspects of the oceans More Definitions → |
orthopaedics | 1. the branch of medical science concerned with disorders or deformities of the spine and joints More Definitions → |
orchestrated | 1. arranged for performance by an orchestra More Definitions → |
oscilloscope | 1. electronic equipment that provides visual images of varying electrical quantities More Definitions → |
orthodontics | 1. the branch of dentistry dealing with the prevention or correction of irregularities of the teeth More Definitions → |
obsolescence | 1. the process of becoming obsolete; falling into disuse or becoming out of date More Definitions → |
outstretched | 1. fully extended especially in length More Definitions → |
overpowering | 1. so strong as to be irresistible More Definitions → |
outrageously | 1. in a very offensive manner 2. to an extravagant or immoderate degree More Definitions → |
overestimate | 1. an appraisal that is too high 2. a calculation that results in an estimate that is too high More Definitions → |
orthodontist | 1. a dentist specializing in the prevention or correction of irregularities of the teeth More Definitions → |
overexposure | 1. the act of exposing film to too much light or for too long a time 2. the act of exposing someone excessively to an influencing experience More Definitions → |
obstetrician | 1. a physician specializing in obstetrics More Definitions → |
orthographic | 1. of or relating to or expressed in orthography More Definitions → |
osteosarcoma | 1. malignant bone tumor; most common in children and young adults where it tends to affect the femur More Definitions → |
otherworldly | 1. existing outside of or not in accordance with nature More Definitions → |
obliteration | 1. destruction by annihilating something 2. the complete destruction of every trace of something More Definitions → |
overburdened | 1. heavily burdened with work or cares More Definitions → |
ossification | 1. the developmental process of bone formation 2. the calcification of soft tissue into a bonelike material More Definitions → |