th
th — abbreviation
1. the written abbreviation for Thursday — the day of the week between Wednesday an
the written abbreviation for Thursday — the day of the week between Wednesday and Friday. Used in calendars, schedules, and informal notes.
The shop is closed every th (Thursday) for cleaning and restocking.
every th (Thursday) — regular weekly schedule
Please hand in your essay by th (Thursday) at 5 pm.
by th at [time] — deadline format
City Health Clinic is open Mon–th from 9 am to 6 pm for walk-in appointments.
A notice on the door said the team meeting is next th at 10:30.
文法句型
day ranges: Mon–th / Tues–th
用法筆記
Common in schedules, calendars, and business writing. The full spelling 'Thursday' is preferred in formal letters and official documents.
常見錯誤
2. the chemical symbol (written as 'Th') for thorium — a silver-white radioactive m
the chemical symbol (written as 'Th') for thorium — a silver-white radioactive metal found naturally in rocks and soil. In scientific formulas and the periodic table, the symbol is always written with a capital T (Th), while informal notes sometimes use lower case (th).
A student pointed to the periodic table on the laboratory wall and read Th as the symbol for thorium.
Th as the symbol for [element]
A chemist wrote the equation using the symbol Th for the thorium atom.
Scientists are studying Th as a potential fuel for a new type of nuclear reactor.
Nellie learned in her geology class that thorium (Th) is more common in the Earth's crust than uranium.
文法句型
Th + verb (in scientific writing)
the symbol Th
用法筆記
In scientific writing the chemical symbol is always capitalised as 'Th'. In less formal contexts the lower-case form 'th' is sometimes used as an abbreviation for the element name.
常見錯誤
th — noun
1. the written medical abbreviation for 'thyroid hormone' — the substance produced
the written medical abbreviation for 'thyroid hormone' — the substance produced inside the thyroid gland that tells the body how fast to use energy. In blood-test reports, a 'th test' measures the amount of this hormone in a patient's blood.
Dr. Chen's lab results showed the patient's th levels were below the normal range, suggesting an underactive thyroid.
th + noun: th levels
A nurse showed the worried patient where th appeared on the lab form and explained it stands for thyroid hormone.
th stands for [full form]
Dr. Patel ordered a th blood test after the patient complained of constant tiredness and weight gain.
Six weeks of daily medication brought the patient's th levels back to the normal range.
文法句型
th + noun (e.g., th levels, th test)
用法筆記
Used only in written medical records, lab reports, and clinical notes. In speaking, doctors usually say 'thyroid hormone' rather than 'th'.