et
et — abbreviation
1. A short written form of 'ethyl', the chemical group C₂H₅−, used in molecular for
A short written form of 'ethyl', the chemical group C₂H₅−, used in molecular formulas and lab reports in organic chemistry.
The lab report showed an ET group attached to the benzene ring.
ET group — ethyl functional group in organic molecules
Esteban noted that the ET substituent increased the compound's volatility.
In organic chemistry textbooks, ET is a standard abbreviation for the ethyl group.
Yara drew the molecule with the ET group clearly labelled on the diagram.
文法句型
ET + noun (e.g., ET group, ET substituent)
用法筆記
Primarily appears in written chemical contexts — molecular diagrams, lab notebooks, and research papers. Not used in spoken chemistry lectures.
2. A written abbreviation for Eastern Time, the time zone covering the US East Coas
A written abbreviation for Eastern Time, the time zone covering the US East Coast (UTC−5 standard / UTC−4 daylight), widely used in TV schedules, meeting announcements, and sports broadcasts.
The webinar starts at 2:00 PM ET; West Coast viewers log in at 11:00 AM PT.
time + ET — standard format for US time zone reference
Quinn set an 8:30 AM ET alarm for the New York earnings call.
The football game is scheduled for 7:00 PM ET on Saturday.
Tamar checked the ET conversion before booking her flight from London.
文法句型
[time] + ET
用法筆記
ET covers both EST (winter) and EDT (summer). When publishing an event time, use ET rather than EST or EDT unless daylight-saving status needs to be explicit. Also used in international contexts for US East Coast coordination.
et — noun
1. A short, informal way of saying 'extraterrestrial' — a being from outer space. T
A short, informal way of saying 'extraterrestrial' — a being from outer space. The term became widely recognized through Steven Spielberg's 1982 film E.T. the Extra-Terrestrial, where the title character is a gentle alien stranded on Earth.
In the film, the children helped the gentle ET return to its home planet.
the ET — referring to a specific extraterrestrial character
Sahil dressed up as an ET for the Halloween party, complete with a glowing finger.
Scientists search for signs of ET in radio signals from distant galaxies.
Hui wondered whether any ET had ever visited our solar system.
- alien
The most common neutral term for any extraterrestrial being, without the warm cultural associations of ET.
- extraterrestrial
The full formal term; more scientific and less emotional in tone.
- space being
An informal, descriptive phrase usable in children's media and casual conversation.
文法句型
the ET
an ET
ET + verb
用法筆記
When referring to the film character, many writers capitalize and punctuate it as E.T. When referring to the general concept of extraterrestrial life (e.g., in SETI discussions), lowercase et or all-caps ET are both used. The form with periods (E.T.) is more common in film reviews and nostalgia contexts.