13-letter words containing p, a, r, o
- pyrolytically — in a pyrolytic manner
- pyrophosphate — a salt or ester of pyrophosphoric acid.
- pyrotechnical — of or relating to pyrotechnics.
- quadraphonics — high-fidelity sound reproduction involving signals transmitted through four different channels.
- quadriphonics — quadraphony.
- quarter point — the fourth part of the distance between any two adjacent points of the 32 marked on a compass, being 2° 48′ 45″.
- quarter pound — a unit of weight equal to a quarter of a pound or 4 ounces avoirdupois
- quaterpolymer — A copolymer derived from four species of monomer.
- racing pigeon — a pigeon bred and trained for the sport of pigeon racing
- racket sports — sports, such as tennis, squash, badminton, etc, that are played using a racket
- radio compass — a radio receiver with a directional antenna for determining the bearing of the receiver from a radio transmitter.
- radiopacities — opaque to radiation; visible in x-ray photographs and under fluoroscopy (opposed to radiotransparent).
- radioteletype — Also called radioteletypewriter [rey-dee-oh-tel-i-tahyp-rahy-ter, -tel-i-tahyp-rahy-] /ˌreɪ di oʊˌtɛl ɪˈtaɪpˌraɪ tər, -ˈtɛl ɪ taɪpˌraɪ-/ (Show IPA). a teletypewriter equipped for transmitting or receiving messages by radio instead of wire.
- random sample — a statistical sample that is devised to avoid interference so that its distribution is affected only by, and so can be held to represent, that of the whole population
- rapprochement — an establishment or reestablishment of harmonious relations: a rapprochement reached between warring factions.
- ration coupon — a coupon that can be exchanged for a certain quantity of rationed goods
- re-absorption — resorption (def 2).
- reading group — a group of people who meet regularly to discuss a book that they have all read
- real property — an estate or property consisting of lands and of all appurtenances to lands, as buildings, crops, or mineral rights (distinguished from personal property).
- realpolitiker — someone who practises or believes in realpolitik
- reapplication — an act or the process of reapplying a substance
- reappointment — a fixed mutual agreement for a meeting; engagement: We made an appointment to meet again.
- reappropriate — suitable or fitting for a particular purpose, person, occasion, etc.: an appropriate example; an appropriate dress.
- reciprocality — given or felt by each toward the other; mutual: reciprocal respect.
- reciprocating — to give, feel, etc., in return.
- reciprocation — an act or instance of reciprocating.
- reciprocative — to give, feel, etc., in return.
- recompilation — the act of compiling: the compilation of documents.
- recomputation — an act, process, or method of computing; calculation.
- record player — phonograph.
- redcloud peak — a mountain in SW Colorado, in the San Juan Mountains, in the S Rocky Mountains. 14,034 feet (4278 meters).
- reduplication — the act of reduplicating; the state of being reduplicated.
- reflectograph — a type of mechanical instrument used for communication with spirits or the dead
- regulator pin — either of two pins on the regulators of certain timepieces, one on each side of the hairspring, that can be moved to adjust the rate of the timepiece.
- rehospitalize — to place in hospital again
- reincorporate — to incorporate again
- repeater loan — a loan lent to someone who has already borrowed
- reperformance — a musical, dramatic, or other entertainment presented before an audience.
- repetitionary — of the nature of repetition, repetitious
- reproachfully — full of or expressing reproach or censure: a reproachful look.
- reprographics — reprography.
- republication — publication anew.
- repunctuation — the act or process of punctuating differently or again
- rhizocephalan — belonging to the Rhizocephala, a group of degenerate hermaphrodite crustaceans that are parasitic chiefly on crabs.
- rhyparography — the painting of still-life, esp of sordid or unpleasant subjects
- rock painting — a painting done on rock, usually by early people
- rogue program — a computer virus
- rolling paper — cigarette paper available in small packages to smokers for rolling their own cigarettes.
- rotary plough — an implement with a series of blades mounted on a power-driven shaft, used to break up soil or weeds
- rough passage — a stormy sea journey