15-letter words containing o, n, t, h

nucleosynthesis — the formation of new atomic nuclei by nuclear reactions, thought to occur in the interiors of stars and in the early stages of development of the universe.
nucleosynthetic — Of or pertaining to nucleosynthesis.
null hypothesis — (in the statistical testing of a hypothesis) the hypothesis to be tested.
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.
object exchange — (protocol) (OBEX) A Bluetooth protocol in the Core Protocol Stack for data exchange.
occulting light — a beacon having a light covered briefly at regular intervals.
odontorhynchous — (of birds) having toothlike ridges inside the beak
okhotsk current — a cold ocean current flowing SW from the Bering Sea, E of the Kurile Islands, along the E coast of Japan where it meets the Japan Current.
old clothes man — a person who deals in second-hand clothes
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.
omnium gatherum — a miscellaneous collection.
omnium-gatherum — a miscellaneous collection.
on (the) record — recorded; publicly or officially declared or known
on a shoestring — If you do something or make something on a shoestring, you do it using very little money.
on heat/in heat — When a female animal is on heat in British English, or in heat in American English, she is in a state where she is ready to mate with a male animal, as this will probably result in her becoming pregnant.
on short notice — with little warning
on the contrary — opposite in nature or character; diametrically or mutually opposed: contrary to fact; contrary propositions.
on the decrease — decreasing
on the heels of — the back part of the human foot, below and behind the ankle.
on the increase — growing, increasing
on the one hand — You use on the one hand to introduce the first of two contrasting points, facts, or ways of looking at something. It is always followed later by on the other hand or 'on the other'.
on the order of — an authoritative direction or instruction; command; mandate.
on the point of — a sharp or tapering end, as of a dagger.
on the port bow — within 45 degrees to the port of straight ahead
on the qui vive — on the qui vive, on the alert; watchful: Special guards were on the qui vive for trespassers.
on the track of — If you are on the track of someone or something, you are trying to find them, or find information about them.
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.
on the verge of — about to
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 of the boys — If a man is described as one of the boys, he is accepted by a group of male friends who do things that are thought of as typically masculine.
one's last hour — the time of one's death
one-night stand — a single performance in one locale, as by a touring theatrical company, before moving on to the next engagement.
one-two (punch) — a sequence of two quick punches, esp. a jab with the left hand followed at once by a hard blow with the right
onychocryptosis — a form of nail disease in which nails are ingrown
open your mouth — If you say that someone does not open their mouth, you are emphasizing that they never say anything at all.
openmouthedness — the state or condition of being filled with amazement and wonder
opisthognathous — having receding jaws.
opposition hold — a particular way of holding rock in mountain-climbing
orchestrational — Of or pertaining to orchestration.
organophosphate — Biochemistry. any of a variety of organic compounds that contain phosphorus and often have intense neurotoxic activity: originally developed as nerve gases, now widely used as insecticides and fire retardants.
ornithodelphian — of or relating to mammals of the class Ornithodelphia
ornithorhynchus — the platypus.
ortho-toluidine — Chemistry. a light-yellow, very slightly water-soluble liquid, C 7 H 9 N, the ortho isomer of toluidine: used in the manufacture of dyes, saccharin, and other organic compounds, and in textile printing processes.
orthodontically — from an orthodontic point of view
osteochondritis — inflammation of bone and cartilage.
osteochondrosis — a disease of bone and cartilage growth centers in children that begins as a necrosis and is followed by regeneration or renewed calcification.
otaheite orange — a small citrus bush, Citrus limonia otaitensis, having fragrant flowers and small orange fruit, often cultivated as a houseplant.
out in the cold — having a relatively low temperature; having little or no warmth: cold water; a cold day.
out in the open — knowledge: public
out of thin air — suddenly and unexpectedly

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