einstein.
One mole of photons, regardless of frequency, as used to measure irradiance.
Meaning & usage
One mole of photons, regardless of frequency, as used to measure irradiance.
The einstein (symbol E) is an obsolete unit with two conflicting definitions.
A genius; a very smart person.
He's a prodigy — they call him their little einstein.
A genius; a very smart person. An idiot; a very stupid person.
Yeah, that guy is a real einstein — he always finds a way to mess up the simplest order.
Where this word comes from
Named in honor of Albert Einstein, who explained the photoelectric effect.
A shape that can be repeated to cover a plane with a nonrepeating pattern.
Where this word comes from
From German ein Stein, "one stone", coined by scientists in recent decades, but with tongue-in-cheek tacit acknowledgment of the homonymy with einstein and Einstein; "a pun playing with the famous scientist's name and the German term "ein Stein" for "one stone".
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.