13-letter words containing no
- phytocoenosis — the plants of a given area considered as a whole.
- piano quartet — a musical composition scored for piano and three other instruments, typically violin, viola, and cello.
- piano quintet — a musical composition scored for a string quartet, or other combination of four instruments, and piano.
- piano teacher — tutor of piano-playing
- plano-concave — pertaining to or noting a lens that is plane on one side and concave on the other.
- plastoquinone — a quinone that occurs in the chloroplasts of plants and functions as an electron carrier during photosynthesis.
- platinocyanic — of or derived from platinocyanic acid.
- platitudinous — characterized by or given to platitudes.
- plenitudinous — characterized or marked by plenitude.
- polynomialism — a polynomial naming system
- polysomnogram — a record of a person's sleep pattern, breathing, heart activity, and limb movements during sleep. Abbreviation: PSG.
- pompano beach — a city in SE Florida.
- pons asinorum — a geometric proposition that if a triangle has two of its sides equal, the angles opposite these sides are also equal: so named from the difficulty experienced by beginners in mastering it. Euclid, 1:5.
- postcanonical — written at a later date than the books belonging to a canon, especially the Bible.
- prediagnostic — of, relating to, or used in diagnosis.
- premenopausal — of, relating to, or characteristic of menopause.
- prenomination — the act of naming in advance of a formal nomination
- prognosticate — to forecast or predict (something future) from present indications or signs; prophesy.
- prolegomenous — prefatory; preliminary; introductory.
- prolonge knot — a knot consisting of three overlapping loops formed by a single rope passed alternately over and under itself at crossings.
- pronominalize — to replace (a noun or noun phrase) with a pronoun.
- pronounceable — to enunciate or articulate (sounds, words, sentences, etc.).
- pronouncement — a formal or authoritative statement.
- prosopagnosia — an inability to recognize faces
- protanomalous — of, relating to, or affected by protanomaly
- protonotariat — the prelates of the Roman Curia
- pycnoconidium — a pycnidiospore
- real soon now — (jargon, humour) (RSN) A phrase used ironically when you believe an event will take a long or unknown time to occur. The term originated in SF's fanzine community, popularised by Jerry Pournelle's column in BYTE. The phrase can be used, for example, when a manager asks how long it will take you to debug some software and you have no idea. "I'll have it working Real Soon Now."
- reconnoitring — the activity of obtaining information about the geographical features of a place or about the size and position of an army there
- rectitudinous — characterized by or given to rectitude.
- reinoculation — a further inoculation of the same organism as the first inoculation
- retinoic acid — a vitamin A derivative, C20H28O2, used in the treatment of acne, skin wrinkles, etc.
- rhinoscleroma — an inflammatory bacterial disease of the nose that is mostly found in Africa and Central America
- right-to-know — of or relating to laws or policies that make certain government or company data and records available to any individual who has a right or need to know their contents.
- roanoke bells — a wild plant, Mertensia virginica, of the borage family, native to the eastern U.S., grown as a garden plant for its handsome, nodding clusters of blue flowers.
- roentgenogram — a photograph made with x-rays.
- roentgenology — the branch of medicine dealing with diagnosis and therapy through x-rays.
- rory o'connor — Also called Roderic. ?1116–98, king of Connaught and last High King of Ireland
- rouge et noir — a gambling game using cards, played at a table marked with two red and two black diamond-shaped spots on which the players place their stakes.
- scalenohedral — a hemihedral crystal form of 8 or 12 faces, each face being a scalene triangle.
- scalenohedron — a hemihedral crystal form of 8 or 12 faces, each face being a scalene triangle.
- selenocentric — having the moon as its center.
- selenographer — the branch of astronomy that deals with the charting of the moon's surface.
- selenotropism — growth in response to moonlight.
- selenous acid — a colorless, transparent, crystalline powder, H2SeO3, soluble in water and used as a reagent
- self-anointed — to rub or sprinkle on; apply an unguent, ointment, or oily liquid to.
- self-hypnosis — autohypnosis.
- self-ignorant — lacking in knowledge or training; unlearned: an ignorant man.
- self-luminous — radiating or reflecting light; shining; bright.
- semi-autonomy — the quality or state of being semiautonomous.