13-letter words containing r, y, o
- parapophysial — of or relating to a parapophysis
- parapsychosis — an abnormal psychosis
- parasymbiosis — the symbiotic relationship that occurs between certain species of fungi and lichens (which are themselves symbiotic associations between a fungus and an alga)
- parasyntheton — a word formed by parasynthesis; for example, kind-hearted
- parthenocarpy — the production of fruit without fertilization of an egg in the ovary.
- participatory — to take or have a part or share, as with others; partake; share (usually followed by in): to participate in profits; to participate in a play.
- partly cloudy — sky: not constantly clear
- party-colored — having different colors in different areas or patches; variegated: a parti-colored dress.
- patrifocality — the system or fact of being patrifocal
- patriot's day — the third Monday in April, a legal holiday in Me. and Mass. commemorating the battles of Lexington and Concord (April 19, 1775)
- patriotically — of, like, suitable for, or characteristic of a patriot.
- patriots' day — the anniversary of the battles of Lexington and Concord (1775), celebrated the third Monday in April: a legal holiday in Massachusetts and Maine.
- patronizingly — displaying or indicative of an offensively condescending manner: a patronizing greeting, accompanied by a gentle pat on the pack.
- pencil crayon — coloured pencil
- peregrinatory — tending to peregrinate; relating to or characteristic of a traveller
- perfunctorily — performed merely as a routine duty; hasty and superficial: perfunctory courtesy.
- periodontally — with respect to periodontal tissue
- perissodactyl — having an uneven number of toes or digits on each foot.
- petrocurrency — money, paid in dollars, earned by a country for the exporting of petroleum
- petrophysical — relating to the analysis of the constitution and characteristics of rocks
- petty officer — navy: non-commissioned officer
- phantasmagory — phantasmagoria.
- pharmacognosy — materia medica (def 2).
- pharyngectomy — excision of part or all of the pharynx.
- pharyngoscope — an instrument for inspecting the pharynx.
- pharyngoscopy — an examination by means of a pharyngoscope.
- phenoxy resin — any of a class of resins derived from polyhydroxy ethers
- phosphorylase — any enzyme, occurring widely in animal and plant tissue, that in the presence of an inorganic phosphate catalyzes the conversion of glycogen into sugar phosphate.
- phosphorylate — to introduce the phosphoryl group into (an organic compound).
- photo gallery — display of collected photographs
- phreatophytic — of, possessing the properties of, or relating to a phreatophyte
- phrygian mode — an authentic church mode represented on the white keys of a keyboard instrument by an ascending scale from E to E.
- phycoerythrin — a red protein pigment occurring in red algae.
- physharmonica — a keyboard musical instrument fitted with free reeds, and which is an early form of harmonium
- physiographic — the science of physical geography.
- physiotherapy — physical therapy.
- phytoestrogen — an estrogen-like compound occurring naturally in plants of the legume family and in grains, vegetables, and fruits.
- phytonutrient — phytochemical.
- phytoplankter — a minute organism which constitutes part of phytoplankton
- phytosanitary — of or relating to the health of plants
- plain yoghurt — natural yoghurt, without added flavouring
- plane journey — a journey made by flying in an aeroplane
- platonic year — a period of about 26,000 years, equal to the time required for a complete revolution of the equinoxes.
- platykurtosis — the state of being platykurtic.
- play for time — a dramatic composition or piece; drama.
- play on words — a pun or the act of punning.
- plethysmogram — the recording of a plethysmograph.
- pleurisy root — a North American milkweed, Asclepias tuberosa, whose root was used as a remedy for pleurisy.
- plymouth rock — a rock at Plymouth, Massachusetts, on which the Pilgrims who sailed on the Mayflower are said to have stepped ashore when they landed in America in 1620.
- polyarteritis — inflammation of the layers of an artery or of many arteries, usually caused by a severe hypersensitivity reaction, and characterized by nodules and hemorrhage along the involved vessels.