18-letter words containing h, y, p, o, s
- sling psychrometer — a psychrometer so designed that the wet-bulb thermometer can be ventilated, to expedite evaporation, by whirling in the air.
- sociopsychological — of, relating to, or characterized by interrelated social and psychological factors.
- sodium hyposulfite — sodium thiosulfate.
- spectroheliography — the process of obtaining an image of the sun in light of a particular wavelength, such as calcium or hydrogen, showing the distribution of the element over the surface and in the solar atmosphere, using a spectroheliograph
- spherical geometry — the branch of geometry that deals with figures on spherical surfaces.
- spotted flycatcher — a European woodland songbird, Muscicapa striata, with a greyish-brown streaked plumage: family Muscicapidae (Old World flycatchers)
- superstring theory — any supersymmetric string theory in which each type of elementary particle is treated as a vibration of a single fundamental string (superstring) at a particular frequency.
- supportive therapy — any treatment, such as the intravenous administration of certain fluids, designed to reinforce or sustain the physiological well-being of a patient
- symphony orchestra — a large orchestra composed of wind, string, and percussion instruments and organized to perform symphonic compositions.
- systematic phoneme — a phonological unit in generative phonology representing an underlying form that takes into account the relationship between phonological patterns and morphological variation, as the unit underlying the second vowel in both derive and derivative.
- temporary hardness — hardness of water due to the presence of magnesium and calcium hydrogencarbonates, which can be precipitated as carbonates by boiling
- the encyclopedists — the writers of the French Encyclopedia (1751-72) edited by Diderot and d'Alembert, which contained the advanced ideas of the period
- to gussy sb/sth up — to give (a person or thing) a smarter or more interesting appearance
- to watch your step — If someone tells you to watch your step, they are warning you to be careful about how you behave or what you say so that you do not get into trouble.
- up to the eyeballs — You use up to the eyeballs to emphasize that someone is in an undesirable state to a very great degree.
- warehouse capacity — the amount of storage space in a warehouse
- white iron pyrites — marcasite
- white-spotted hyla — a type of tree frog (H. leucophyllata) of tropical America
- wireless telephony — Now Rare. radiotelephony.
- withdrawal symptom — effects of stopping a drug
- working hypothesis — See under hypothesis (def 1).