13-Letter Words Starting With O
Here's the list of all the 475 13-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) | |
|---|---|
| objectionable | 1. causing disapproval or protest 2. liable to objection or debate; used of something one might take exception to More Definitions → |
| ophthalmology | 1. the branch of medicine concerned with the eye and its diseases More Definitions → |
| observational | 1. relying on observation or experiment More Definitions → |
| opportunistic | 1. taking immediate advantage, often unethically, of any circumstance of possible benefit More Definitions → |
| orchestration | 1. an arrangement of a piece of music for performance by an orchestra or band 2. the act of arranging a piece of music for an orchestra and assigning parts to the different musical instruments More Definitions → |
| operationally | 1. in respect to operation More Definitions → |
| ornamentation | 1. the state of being ornamented 2. something used to beautify More Definitions → |
| osteomyelitis | 1. an inflammation of bone and bone marrow (usually caused by bacterial infection) More Definitions → |
| orthogonality | 1. the relation of opposition between things at right angles 2. the quality of lying or intersecting at right angles More Definitions → |
| overstatement | 1. making to seem more important than it really is More Definitions → |