16-letter words containing p, i, r, a, c, y
- pyramidal orchid — a chalk-loving orchid, Anacamptis pyramidalis, bearing a dense cone-shaped spike of purplish-pink flowers with a long curved spur
- pyroracemic acid — pyruvic acid.
- pyrovanadic acid — an oxyacid of vanadium, known chiefly in the form of its vanadate salts; Formula: H4V2O7
- pyruvic aldehyde — a yellow, liquid compound, C 3 H 4 O 2 , containing both an aldehyde and a ketone group, usually obtained in a polymeric form: used chiefly in organic synthesis.
- quasi-compulsory — required; mandatory; obligatory: compulsory education.
- radiographically — the production of radiographs.
- ramsden eyepiece — an eyepiece consisting of two plano-convex crown-glass lenses of equal focal length, placed with the convex sides facing each other and with a separation between the lenses of about two-thirds of the focal length of each.
- republican party — one of the two major political parties in the U.S.: originated 1854–56.
- reserve capacity — the capacity of a battery, measured in minutes, to keep a vehicle operating if the charging system fails.
- restriction play — a limited number of opening moves that are predetermined by their chance selection from an accepted list.
- rhynchocephalian — belonging or pertaining to the Rhynchocephalia, an order of lizardlike reptiles that are extinct except for the tuatara.
- special delivery — (in the U.S. Postal Service) delivery of mail outside the regularly scheduled hours, by a special messenger, upon the payment of an extra fee.
- specific gravity — the ratio of the density of any substance to the density of some other substance taken as standard, water being the standard for liquids and solids, and hydrogen or air being the standard for gases.
- spraying machine — a device for spraying large volumes of liquid, such as insecticide onto crops
- standing cypress — a plant, Ipomopsis rubra, of the southern U.S., having feathery leaves and clusters of red and yellow flowers.
- stonecrop family — the plant family Crassulaceae, characterized by succulent herbaceous plants and shrubs with simple, fleshy leaves, clusters of small flowers, and dry, dehiscent fruit, and including hen-and-chickens, houseleek, kalanchoe, live-forever, orpine, sedum, and stonecrop.
- storage capacity — amount of room or space
- thermoplasticity — soft and pliable when heated, as some plastics, without any change of the inherent properties.
- thrombocytopenia — an abnormal decrease in the number of blood platelets.
- tropical cyclone — a cyclone that originates over a tropical ocean area and can develop into the destructive storm known in the U.S. as a hurricane, in the western Pacific region as a typhoon, and elsewhere by other names. Compare extratropical cyclone, hurricane (def 1), willy-willy.
- trucking company — a company that transports goods by lorry
- unpredictability — not predictable; not to be foreseen or foretold: an unpredictable occurrence.
- ventriculography — radiography of the ventricles of the heart after injection of a contrast medium
- videodisc player — an electronic device for playing videodiscs through a television set.