13-letter words containing o, s, e, t, i
- oceanic crust — the brown, hard outer portion or surface of a loaf or slice of bread (distinguished from crumb).
- octogenarians — Plural form of octogenarian.
- odontogenesis — the development of teeth.
- odontornithes — a proposed class of birds that possess teeth
- off the rails — into or in a state of dysfunction or disorder
- oilspot glaze — a brown or black ceramic glaze dotted with silvery spots caused by impurities.
- oligopeptides — Plural form of oligopeptide.
- omnipresently — In an omnipresent manner.
- on its merits — on the intrinsic qualities or virtues
- on one's time — the system of those sequential relations that any event has to any other, as past, present, or future; indefinite and continuous duration regarded as that in which events succeed one another.
- on the inside — in a position allowing access to secret information, special advantage or favor, etc.
- on the parish — receiving parochial relief
- one's forties — the ages between 40 and 49
- one's sixties — the ages between 60–69
- oneiroscopist — a person who specialises in studying and interpreting dreams
- onomatopoeias — Plural form of onomatopoeia.
- open position — Music. the arrangement of a chord with wide intervals between the parts.
- open question — question: invites long answer
- open registry — ship registration under a national flag available to all ships regardless of nationality.
- operativeness — (uncountable) The state or quality of being operative.
- opportunities — Plural form of opportunity.
- optical mouse — (hardware) Any kind of mouse that uses visible light or infrared to detect changes in its position.
- orchestra pit — musicians' seating in front of stage
- orchestra-pit — a group of performers on various musical instruments, including especially stringed instruments of the viol class, clarinets and flutes, cornets and trombones, drums, and cymbals, for playing music, as symphonies, operas, popular music, or other compositions.
- orchestralist — a person who writes or arranges orchestral music
- orchestrating — Present participle of orchestrate.
- orchestration — (uncountable) the arrangement of music for performance by an orchestra.
- orchiectomies — Plural form of orchiectomy.
- organ whistle — a steam or air whistle in which the jet is forced up against the thin edge of a pipe closed at the top.
- originalities — Plural form of originality.
- ornamentalism — the desire or tendency to feature ornament in the design of buildings, interiors, furnishings, etc.
- ornamentalist — A person who ornaments.
- orthogonalise — to make (vectors, functions, etc.) orthogonal.
- orthographies — Plural form of orthography.
- orthosilicate — a silicate mineral
- osa extension — (OSAX) Any extension to Macintosh OSA.
- oscillometric — an instrument for measuring oscillations, especially those of the arterial pulse.
- ostensibility — The quality of being ostensible.
- osteofibrosis — loss of calcium from the bones, causing them to become fragile
- osteomyelitis — an inflammation of the bone and bone marrow, usually caused by bacterial infection.
- osteopetrosis — any of several hereditary diseases characterized by increased bone density.
- osteophytosis — Lb medicine The presence of osteophytes.
- osteoplasties — Plural form of osteoplasty.
- ostreiculture — the breeding of oysters
- otherworldish — characterized by otherworldliness
- outlaw strike — wildcat strike.
- outprocessing — to end a military tour of duty, accompanied by necessary paperwork: All enlisted soldiers out-process as a class.
- outside-right — a footballer who plays on the outside right wing of the field
- outstretching — Present participle of outstretch.
- ovariectomies — Plural form of ovariectomy.