15-letter words containing o, a, m
- numismatologist — One versed in numismatology.
- obituary column — the division of a publication reserved for obituaries
- occipitomastoid — (anatomy) Relating to, or connecting the occipital and mastoid bones.
- ocean of storms — the largest of the dark plains (maria) on the surface of the moon, situated in the second and third quadrant
- odd permutation — a permutation of a set of n elements, x 1 , x 2 , …, xn, which permutes the product of all differences of the form (xi – xj), where i is less than j, into the negative of the product.
- odontostomatous — having jaws that resemble teeth
- of mice and men — a novel (1937) and play (1938) by John Steinbeck.
- officer of arms — an officer with the duties of a herald, especially one charged with the devising, granting, or confirming of armorial bearings.
- official family — the executives or officials chiefly responsible for the operation of an organization or government.
- old clothes man — a person who deals in second-hand clothes
- old father time — time personified
- old high german — High German before 1100. Abbreviation: OHG.
- old man's beard — fringe tree.
- old-man's-beard — fringe tree.
- 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.
- 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.
- 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.
- omnium gatherum — a miscellaneous collection.
- omnium-gatherum — a miscellaneous collection.
- on/off the mark — If something is off the mark, it is inaccurate or incorrect. If it is on the mark, it is accurate or correct.
- one-dimensional — having one dimension only.
- onomasiological — the study of the means of expressing a given concept.
- open admissions — a policy of admitting applicants to an institution, especially a university, regardless of previous academic record or grades.
- opencast mining — mining by excavating from the surface
- opening batsman — a player who bats the first ball in cricket
- operations room — a room from which all the operations of a military, police, or other disciplined activity are controlled
- 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.
- 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.
- 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 chromide — an Asian cichlid fish, Etropus maculatus, with a brownish-orange spotted body
- orange milkweed — butterfly weed (def 1).
- orangeman's day — the 12th of July, celebrated by Protestants in Northern Ireland to commemorate the anniversary of the Battle of the Boyne (1690)
- orangemen's day — July 12, an annual celebration in Northern Ireland and certain cities having a large Irish section, especially Liverpool, to mark both the victory of William III over James II at the Battle of the Boyne, July 1, 1690, and the Battle of Augbrim, July 12, 1690.
- 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).
- ordinary income — taxable income, as salary and wages, other than capital gains.
- ordinary seaman — a seaman insufficiently skilled to be classified as an able-bodied seaman. Abbreviation: O.D., O.S., o.s.
- organic farming — farming with organic methods
- organized crime — illegal activities co-ordinated by groups
- organomagnesium — pertaining to or noting an organic compound, especially an organic halide, containing magnesium linked to carbon.
- organomercurial — an organic compound containing mercury
- oscars ceremony — a formal annual event in the United States in which small gold statuettes are awarded by the Academy of Motion Picture Arts and Sciences for outstanding achievements in films
- outdoorsmanship — a person devoted to outdoor sports and recreational activities, as hiking, hunting, fishing, or camping.
- over-assessment — too much assessment