15-letter words containing r, m, e, t, h
- new hampshirite — of New Hampshire
- niche marketing — marketing aimed at a specialized group
- nonmetaphorical — not metaphorical; literal
- northeast storm — a cyclonic storm that moves northeastward within several hundred miles of the eastern coast of the U.S. and Canada, particularly in fall and winter, its often strong northeast winds causing high seas and coastal damage and bearing rain or snow.
- nottinghamshire — a county in central England. 854 sq. mi. (2210 sq. km).
- nyquist theorem — (communications) A theorem stating that when an analogue waveform is digitised, only the frequencies in the waveform below half the sampling frequency will be recorded. In order to reconstruct (interpolate) a signal from a sequence of samples, sufficient samples must be recorded to capture the peaks and troughs of the original waveform. If a waveform is sampled at less than twice its frequency the reconstructed waveform will effectively contribute only noise. This phenomenon is called "aliasing" (the high frequencies are "under an alias"). This is why the best digital audio is sampled at 44,000 Hz - twice the average upper limit of human hearing. The Nyquist Theorem is not specific to digitised signals (represented by discrete amplitude levels) but applies to any sampled signal (represented by discrete time values), not just sound.
- old father time — time personified
- 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.
- open your mouth — If you say that someone does not open their mouth, you are emphasizing that they never say anything at all.
- over-enthusiasm — absorbing or controlling possession of the mind by any interest or pursuit; lively interest: He shows marked enthusiasm for his studies.
- overachievement — to perform, especially academically, above the potential indicated by tests of one's mental ability or aptitude.
- oyster mushroom — oyster cap.
- parasympathetic — pertaining to that part of the autonomic nervous system consisting of nerves and ganglia that arise from the cranial and sacral regions and function in opposition to the sympathetic system, as in inhibiting heartbeat or contracting the pupil of the eye.
- parchment paper — a waterproof and grease-resistant paper produced by treating ordinary paper with concentrated sulfuric acid.
- permanent tooth — any of the 32 adult teeth that replace the 20 milk teeth.
- petroleum ether — a volatile mixture of the higher alkane hydrocarbons, obtained as a fraction of petroleum and used as a solvent
- pharmacotherapy — the treatment of disease through the administration of drugs.
- photomicroscope — a microscope having an illuminator and a camera mechanism for producing a photomicrograph.
- photomultiplier — an extremely sensitive detector of light and of other radiation, consisting of a tube in which the electrons released by radiation striking a photocathode are accelerated, greatly amplifying the signal obtainable from small quantities of radiation.
- pilgrim fathers — the Pilgrims (of Plymouth Colony)
- plant-hire firm — a company that hires out mobile mechanical equipment for construction, road-making, etc
- play the market — to speculate on a stock exchange
- plethysmography — the tracking of changes measured in bodily volume
- pneumatotherapy — the use of compressed or rarefied air in treating disease.
- poikilothermism — the state or quality of being cold-blooded, as fishes and reptiles.
- pontine marshes — an area of W Italy, southeast of Rome: formerly malarial swamps, drained in 1932–34 after numerous attempts since 160 bc had failed
- posthemorrhagic — occurring after a haemorrhage
- power macintosh — Power Mac
- primary feather — any of the flight feathers growing from the manus of a bird's wing
- primary teacher — a teacher in a primary school
- protonephridium — a tubular, excretory structure in certain invertebrates, as flatworms, rotifers, and some larvae, usually ending internally in flame cells and having an external pore
- psychochemistry — the treatment of mental illnesses by drugs
- pulmobranchiate — possessing a pulmobranch
- raw-pack method — cold pack (def 2).
- refreshment bar — a bar or stall that offers a variety of drinks for sale
- retirement home — care facility for elderly people
- reverend mother — a title of respect or form of address for the Mother Superior of a convent
- rheumatic fever — a serious disease, associated with streptococcal infections, usually affecting children, characterized by fever, swelling and pain in the joints, sore throat, and cardiac involvement.
- rheumatism-root — spotted wintergreen.
- rhyming couplet — a pair of lines in poetry that rhyme and usually have the same rhythm
- roche moutonnee — a rounded, glacially eroded rock outcrop, usually one of a group, resembling a sheep's back.
- rolle's theorem — the theorem that a differentiable function having equal values at the endpoints of an interval has a derivative equal to zero at some point in the interval.
- run of the mill — merely average; commonplace; mediocre: just a plain, run-of-the-mill house; a run-of-the-mill performance.
- run-of-the-mill — merely average; commonplace; mediocre: just a plain, run-of-the-mill house; a run-of-the-mill performance.
- run-of-the-mine — of or relating to ore or coal that is crude, ungraded, etc.
- rutherford atom — the atom postulated as analogous to the solar system, with electrons revolving around a small, central, positive nucleus that constitutes practically the entire mass of the atom
- saccharomycetes — a collective name for yeasts
- sarcenchymatous — relating to the connective tissue of some sponges