13-letter words containing n, u, m, a
- platinum disc — (in Britain) an album certified to have sold 300 000 copies or a single certified to have sold 600 000 copies
- plough monday — the first Monday after Epiphany, which in N and E England used to be celebrated with a procession of ploughmen drawing a plough from house to house
- pneumatograph — pneumograph.
- pneumatolysis — the process by which rocks are altered or minerals and ores are formed by the action of vapors given off by magma.
- pneumatolytic — resulting from pneumatolysis
- pneumatometer — an instrument for measuring either the quantity of air inhaled or exhaled during a single inspiration or expiration or the force of inspiration or expiration.
- pneumatophore — Botany. a specialized structure developed from the root in certain plants growing in swamps and marshes, serving as a respiratory organ.
- pneumogastric — of or relating to the lungs and stomach.
- pococurantism — a careless or indifferent person.
- poison sumach — an anacardiaceous swamp shrub, Rhus (or Toxicodendron) vernix of the southeastern US, that has greenish-white berries and causes an itching rash on contact with the skin
- pons asinorum — a geometric proposition that if a triangle has two of its sides equal, the angles opposite these sides are also equal: so named from the difficulty experienced by beginners in mastering it. Euclid, 1:5.
- postmenstrual — of or relating to menstruation or to the menses.
- pre-columbian — of or relating to the Americas before the arrival of Columbus: pre-Columbian art; pre-Columbian Indians.
- premandibular — situated in front of the mandible
- premenopausal — of, relating to, or characteristic of menopause.
- pretournament — occurring prior to a tournament
- protanomalous — of, relating to, or affected by protanomaly
- protoactinium — protactinium.
- prudentialism — a regard for prudential, rather than moral, considerations
- public domain — the status of a literary work or an invention whose copyright or patent has expired or that never had such protection.
- pump-and-dump — the practice of buying shares, generating favourable publicity about them, especially on the internet, then selling them when the price accordingly rises
- pumpkinheaded — a slow or dim-witted person; dunce.
- purple martin — a large American swallow, Progne subis, the male of which is blue-black.
- pusillanimity — the state or condition of being pusillanimous; timidity; cowardliness.
- pusillanimous — lacking courage or resolution; cowardly; faint-hearted; timid.
- quadrigeminal — Having four parts, or two pairs.
- quantity mark — a mark that is placed above a vowel or syllable to indicate its duration or length
- quantum state — the condition in which a physical system exists, usually described by a wave function or a set of quantum numbers.
- quartodeciman — one of a group of early Christians who observed Easter on the day of the Jewish Passover regardless of whether or not it was Sunday
- queen's metal — any of several alloys containing antimony and tin and resembling britannia metal
- question mark — Also called interrogation point, interrogation mark. a mark indicating a question: usually, as in English, the mark (?) placed after a question.
- quindicessima — (music) Two octaves higher. Marking indicates a passage to be transposed up two octaves. Abbreviation: 15ma.
- quinquagesima — the Sunday before Lent; Shrove Sunday.
- radioactinium — the radioactive isotope of thorium having a mass number 227 and a half-life of 18.8 days. Symbol: RdAc, Th 227.
- rambling club — a club for people who enjoy taking walks in the country
- random number — pseudorandom number
- random rubble — masonry in which untooled stones are set without coursing
- recomputation — an act, process, or method of computing; calculation.
- reformulation — to formulate again.
- regiomontanus — Friedrich Max [free-drik maks;; German free-drikh mahks] /ˈfri drɪk mæks;; German ˈfri drɪx mɑks/ (Show IPA), 1823–1900, English Sanskrit scholar and philologist born in Germany.
- remanufacture — to refurbish (a used product) by renovating and reassembling its components: to remanufacture a vacuum cleaner.
- remeasurement — the process of measuring again
- republicanism — republican government.
- restimulation — the act or process of stimulating again; reactivation
- resublimation — Psychology. the diversion of the energy of a sexual or other biological impulse from its immediate goal to one of a more acceptable social, moral, or aesthetic nature or use.
- revenue stamp — a stamp showing that a governmental tax has been paid.
- rhumb sailing — sea navigation along rhumb lines.
- roman numeral — one of the numerals in the ancient Roman system of notation, still used for certain limited purposes, as in some pagination, dates on buildings, etc. The common basic symbols are I, (=1), V, (=5), X, (=10), L, (=50), C, (=100), D, (=500), and M, (=1000). The Roman numerals for one to nine are: I, II, III, IV, V, VI, VII, VIII, IX. A bar over a letter multiplies it by 1000; thus, X̅ equals 10,000. Integers are written according to these two rules: If a letter is immediately followed by one of equal or lesser value, the two values are added; thus, XX equals 20, XV equals 15, VI equals 6. If a letter is immediately followed by one of greater value, the first is subtracted from the second; thus, IV equals 4, XL equals 40, CM equals 900. Examples: XLVII(=47), CXVI(=116), MCXX(=1120), MCMXIV(=1914). Roman numerals may be written in lowercase letters, though they appear more commonly in capitals.
- rose geranium — a geranium, Pelargonium graveolens, cultivated for its fragrant, lobed or narrowly divided leaves.
- rough diamond — gemstone: uncut diamond