Definition

1. Adjective:
   • Extremely small; too small to be seen clearly without the aid of a microscope. This meaning emphasizes the minute or minuscule size of an object.
   • Relating to, performed with, or visible only through the use of a microscope. This meaning describes something connected to the instrument or the scale of observation it enables.
   • Characterized by or involving great attention to minute details. This figurative meaning describes an extremely detailed and precise examination.

Examples of Usage

• Adjective:
  • The scientist discovered a microscopical organism in the water sample. (The organism was too small to see without a microscope.)
  • A microscopical examination of the tissue revealed the presence of abnormal cells. (The examination was performed using a microscope.)
  • He conducted a microscopical analysis of the historical document, noting every ink variation. (The analysis was extremely detailed and precise.)

Advanced Usage

• "microscopical world": refers to the universe of objects and organisms that are too small to be seen with the naked eye.
  • Biology students explore the microscopical world in their lab sessions.
• "microscopical detail": used figuratively to describe an extremely high level of detail.
  • The artist painted the portrait with microscopical detail, capturing every eyelash.

Variants and Related Words

• Microscopic (adj): This is the more common variant and is fully interchangeable with "microscopical" in all its meanings.
  • The differences between the two samples were microscopic.
• Microscope (n): an optical instrument used for viewing very small objects.
• Microscopy (n): the technical field of using microscopes.

Synonyms

• Minuscule: extremely small.
• Infinitesimal: extremely or immeasurably small.
• Ultramicroscopic: too small to be seen even with an ordinary light microscope.

Antonyms

• Macroscopic: large enough to be seen by the naked eye.
• Gigantic: of very great size or extent.
• Enormous: very large in size, quantity, or extent.

Notes on Usage

• The adjectives microscopical and microscopic are synonymous. "Microscopic" is the far more frequent form in modern English across all definitions, while "microscopical" is less common but still correct, especially in more formal or scientific contexts.
• In its figurative sense ("extremely detailed"), microscopic is the overwhelmingly preferred form (e.g., "microscopic attention to detail").

Adjective

1. so small as to be invisible without a microscope
   • differences were microscopic
2. visible under a microscope; using a microscope
3. of or relating to or used in microscopy
   • microscopic analysis
   • microscopical examination