English Words: P
46,516 words · Page 430 of 931
A hypothetical particle having physical quantities on the Planck scale, most importantly being one Planck mass in mass.
A hypothetical astronomical object whose energy is around the Planck density (5.155 × 10⁹⁶ kg/m³).
The fundamental upper limit of temperature conceivable under current models of physics, in which all matter is accelerated as quickly as possible to the speed of light, approximately 1.41679 × 10³² kelvins.
A natural unit of time, equivalent to the time it takes light to traverse one Planck length; it is the duration of time at which quantum gravity effects are expected to become significant.
Any one of several natural units in a system originally proposed by Max Planck based on universal constants. Symbols for Planck units are the symbol for the physical quantity with a subscript P.
the constant of proportionality (symbol ℎ), relating the energy and frequency of a photon (6.626×10⁻³⁴ joule-second); also related to the indeterminacy limit in the Heisenberg uncertainty principle; the quantum of action
The view that “science progresses one funeral at a time”, that scientific progress happens when older generations of scientists retire or die.
Of or pertaining to Max Planck (1858–1947), German physicist and founder of quantum theory.
A deliberately planned pandemic, typically supposed as part of a conspiracy theory. (Often associated with COVID-19.)
A technique for navigation using the assumption that the journey occurs over a plane or flat surface rather than the actual curved surface of the Earth, which is sufficiently accurate over short distances.
an astronomical object with enough mass to achieve hydrostatic equilibrium, but not enough to initiate core fusion at any time in its existence. That is, it is rounded in shape and is smaller than a star. Planemos include planets, dwarf planets, and the larger moons of the Solar System (satellite planets), but also sub-brown dwarfs and rogue planets between the stars.
A tool which smooths a surface or makes one surface of a workpiece parallel to the tool's bed.
A small-leaved North American tree (Planera aquatica) related to the elm, but bearing nuts without wings.
The observation and logging of the registration numbers (tailnumbers) of aircraft as a hobby.
Each of the seven major bodies which move relative to the fixed stars in the night sky—the Moon, Mercury, Venus, the Sun, Mars, Jupiter and Saturn.
The deliberate inclusion in broadcast media of messages warning about climate change or promoting environmental sustainability.
A hypothetical planet in the Solar system, beyond the currently known outermost planet. (The term was applied to Eris for a short while, when Pluto was still considered the ninth planet.)
Afflicted by the astrological influence of a planet; struck down with amazement or shock; panic-stricken.
Membership of a particular planet or moon, by origin, birth, naturalization, ownership, allegiance or otherwise.
Spelling & Dictionary Insight
The English alphabetical index for the letter P contains 46,516 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 931 pages, and you are currently viewing page 430. Every row above is a dictionary-backed entry with a canonical slug, and each links through to a full definition page with pronunciation, senses, etymology, and related-word data where available.
On this page 50 of 50 entries carry a part-of-speech tag and 50 carry at least one stored definition. Coverage varies across letters because Wiktionary volunteers build entries at different speeds for different parts of the alphabet, letters with common starting sounds (S, C, T, P) usually have the densest coverage, while less frequent starters (X, Q, Z) tend to have shorter but more specialised lists. PlainSpell surfaces whatever data is present and links back to the source when a definition is not yet recorded.
For readers using this index as a spelling reference, the guarantee is that every form you see on the list is a documented English headword, not a guess, not a derived inflection lacking a lemma row. If a word you expected to find is absent from the "P" list, it usually means the form exists only as an inflection of another lemma (e.g. a past participle stored under the infinitive) or the entry has not yet been imported from Wiktionary. Use the search bar or the misspelling lookup to resolve these cases.