Definition

1. Noun:
   • Thorium: A soft, silvery-white, tetravalent, radioactive metallic element. Its isotope 232 is used as a power source in nuclear reactors, and it occurs in minerals such as thorite and monazite sands.
   • Thursday: The fifth day of the week, following Wednesday and preceding Friday; often considered the fourth working day in many cultures.

Usage Examples

• Noun (Thorium):
  • The scientist studied the properties of th for potential use in advanced nuclear energy systems.
  • Monazite sand is a primary source for extracting th.
• Noun (Thursday):
  • Our weekly team meeting is scheduled for Th.
  • She will arrive next Th.

Advanced Usage

• Chemical Symbol: In scientific contexts, "Th" is the standard chemical symbol for the element thorium on the periodic table.
  • The periodic table lists Th with atomic number 90.
• Abbreviation: "Th" or "Thu." is a common written abbreviation for Thursday in calendars and schedules.
  • The appointment is marked for Th, 14th May.

Variants and Related Words

• Thorium-232 (n): The most common and stable isotope of thorium, used as nuclear fuel.
• Thursday (n): The full, unabbreviated form of the day of the week.

Synonyms

• For "Thorium": Element 90 (contextual synonym based on atomic number).
• For "Thursday": None (it is a proper noun for a specific day).

Notes on Different Meanings

The meaning of "th" is entirely context-dependent. In a scientific, chemical, or engineering text, it almost certainly refers to the element thorium. In everyday writing, such as on a calendar, diary, or informal note, it is an abbreviation for Thursday. It is not typically used as a standalone word in spoken language for either meaning; one would say "thorium" or "Thursday" in full.

Noun

1. a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands
2. the fifth day of the week; the fourth working day