13-letter words containing a, l, s, t, o
- object pascal — (language) An object-oriented Pascal developed jointly by Apple Computer and Niklaus Wirth.
- observability — capable of being or liable to be observed; noticeable; visible; discernible: an observable change in attitude.
- observational — of, relating to, or founded on observation, especially founded on observation rather than experiment.
- obstacle race — a foot race in which the contestants are prevented in a specific way from covering the full course at top speed, as by having hurdles to jump, sacks enclosing the legs, or potatoes to pick up.
- obstetrically — (medicine) In terms of obstetrics.
- occasionalist — a person who subscribes to the theory of occasionalism
- occasionality — the condition or character of being infrequent or intended for a specific occasion, or that which is infrequent or intended for a specific occasion
- occidentalism — Occidental character or characteristics.
- octagon scale — a scale used in laying out octagonal figures of various sizes.
- octosyllables — Plural form of octosyllable.
- odontoblastic — Relating to odontoblasts.
- of all others — above all others
- 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.
- old ritualist — Raskolnik.
- old stone age — the Paleolithic period.
- old testament — the first of the two main divisions of the Christian Bible, comprising the Law, the Prophets, and the Hagiographa. In the Vulgate translation all but two books of the Apocrypha are included in the Old Testament.
- olfactologist — a medical specialist in the sense of smell
- olfactometers — Plural form of olfactometer.
- omoplatoscopy — Divination by use of a shoulder blade.
- onanistically — In an onanistic manner.
- onomastically — In an onomastic way.
- onomatologist — One versed in the history of names.
- opthalmoscope — Misspelling of ophthalmoscope.
- optical glass — any of several types of high-quality, homogeneous, color-free glass, as flint or crown glass, having specified refractive properties, used in lenses and other components of optical systems.
- optical mouse — (hardware) Any kind of mouse that uses visible light or infrared to detect changes in its position.
- optical sound — sound recorded on and subsequently played back from an optical or photographic soundtrack, as opposed to a magnetic soundtrack.
- oral solution — An oral solution is a medicine in liquid form for drinking.
- orchestralist — a person who writes or arranges orchestral music
- 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.
- orgiastically — In an orgiastic fashion.
- 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.
- orthosilicate — a silicate mineral
- oscillational — characterized by oscillation
- osmoregulator — Any organism that practices osmoregulation.
- osteoblastoma — (oncology) an uncommon osteoid tissue-forming primary neoplasm of the bone.
- osteoplasties — Plural form of osteoplasty.
- outlaw strike — wildcat strike.
- outstandingly — prominent; conspicuous; striking: an outstanding example of courage.
- outwash plain — Geology. a broad, sloping landform built of coalesced deposits of outwash.
- overspeculate — to engage in thought or reflection; meditate (often followed by on, upon, or a clause).
- overstability — the state of being excessively stable
- overstimulate — to stimulate too much
- ovipositional — pertaining to the laying of eggs through an ovipositor
- pact of steel — a military alliance concluded between Nazi Germany and Fascist Italy on May 22, 1939, committing each to assist the other in the event of war with another power and pledging that neither would seek a separate peace or armistice.
- palaeocrystic — consisting of former glacial formation
- palazzo pants — women's trousers with very wide legs