15-letter words containing a, o, l
- old-established — established for a long time
- old-man-the-sea — (in The Arabian Nights' Entertainments) an old man who clung to the shoulders of Sindbad the Sailor for many days and nights.
- old-man's-beard — fringe tree.
- oldenbarneveldt — Johan van. 1547–1619, Dutch statesman, regarded as a founder of Dutch independence; the leading figure (from 1586) in the United Provinces of the Netherlands: executed by Maurice of Nassau
- olfactory nerve — either one of the first pair of cranial nerves, consisting of sensory fibers that conduct to the brain the impulses from the mucous membranes of the nose.
- olfactory tract — a long narrow triangular band of white tissue originating in the olfactory bulb and extending back to the point at which its fibres enter the base of the cerebrum
- oligodendroglia — Oligodendrocytes collectively.
- oligohydramnios — (medicine) A deficit of amniotic fluid in the amniotic sac, causing distinctive deformations of the foetus.
- oligomerisation — Alternative spelling of oligomerization.
- oligomerization — (chemistry) The formation of an oligomer from a monomer.
- oligosaccharide — any carbohydrate yielding few monosaccharides on hydrolysis, as two, three, or four.
- omega-algebraic — In domain theory, a complete partial order is algebraic if every element is the lub of some chain of compact elements. If the set of compact elements is countable it is omega-algebraic. Usually written with a Greek letter omega (LaTeX \omega).
- omnidirectional — sending or receiving signals in all directions: an omnidirectional microphone.
- on an even keel — Nautical. a central fore-and-aft structural member in the bottom of a hull, extending from the stem to the sternpost and having the floors or frames attached to it, usually at right angles: sometimes projecting from the bottom of the hull to provide stability.
- on the trail of — If you are on the trail of a person or thing, you are trying hard to find them or find out about them.
- once in a while — at one time in the past; formerly: I was a farmer once; a once powerful nation.
- one-dimensional — having one dimension only.
- one's last hour — the time of one's death
- onomasiological — the study of the means of expressing a given concept.
- open-ended loan — An open-ended loan is an extension of credit where money can be borrowed when you need it, and paid back on an ongoing basis, such as a credit card.
- open-pollinated — (of a flower) pollinated without human agency.
- opening balance — the amount of money in an account at the start of an accounting period
- operating cycle — the period of time between starting a business and making a profit
- operating table — table on which surgery is performed
- operationalised — Simple past tense and past participle of operationalise.
- operationalized — Simple past tense and past participle of operationalize.
- ophthalmologist — a doctor of medicine specializing in ophthalmology.
- ophthalmophobia — the fear of being stared at
- ophthalmoplegia — Paralysis of the muscles within or surrounding the eye.
- ophthalmoscopes — Plural form of ophthalmoscope.
- ophthalmoscopic — Of, pertaining to or using an ophthalmoscope.
- oppositionality — Quality of being oppositional.
- optical printer — a film printer used in making optical effects, consisting basically of a camera that photographs the image with special lenses to enlarge, reduce, distort, etc., and a projector that transfers the image to the print stock, as distinguished from a contact printer.
- optical pumping — a method for increasing the number of atoms or molecules occupying higher energy levels by irradiating them with light of the proper frequencies to raise them to those levels.
- optical scanner — the process of interpreting data in printed, handwritten, bar-code, or other visual form by a device (optical scanner or reader) that scans and identifies the data.
- optical storage — optical disk drive
- optical tooling — the technique of establishing precise reference lines and planes by means of telescopic sights, especially for the purpose of aligning machinery, machine-shop work, etc.
- opus anglicanum — fine embroidery, esp of church vestments, produced in England c.1200–c.1350; characterized by the rich materials used, esp silver gilt thread
- orange milkweed — butterfly weed (def 1).
- orchestrational — Of or pertaining to orchestration.
- order of battle — the organization or hierarchy of military forces in preparation for a battle.
- ordinal numbers — Also called ordinal numeral. any of the numbers that express degree, quality, or position in a series, as first, second, and third (distinguished from cardinal number).
- organized labor — all workers who are organized in labor unions.
- organochlorines — Plural form of organochlorine.
- organomercurial — an organic compound containing mercury
- oriental carpet — Oriental rug.
- orientationally — With regard to orientation.
- ornithodelphian — of or relating to mammals of the class Ornithodelphia
- orthodontically — from an orthodontic point of view
- orthokeratology — a technique for correcting refractive errors in vision by changing the shape of the cornea with the temporary use of progressively flatter hard contact lenses.