microscopic

Skin cells, bacteria, and some kinds of algae are all microscopic, or too small to see without a microscope.

Use the adjective microscopic to describe things that are so tiny you can't see them. The word is a scientific term if you literally mean "can be seen with a microscope," although people use it sometimes to mean "really small," as in the phrase "Wow, your feet are microscopic." Mikros means "small" in Greek, and the scope part of the word comes from the Greek word skopein, "to examine."

Definitions of microscopic
  1. adjective
    so small as to be invisible without a microscope
    “differences were microscopic
    synonyms: microscopical
    little, small
    limited or below average in number or quantity or magnitude or extent
  2. adjective
    visible under a microscope; using a microscope
    synonyms: microscopical
    seeable, visible
    capable of being seen; or open to easy view
  3. adjective
    of or relating to or used in microscopy
    microscopic analysis”
    synonyms: microscopical
  4. adjective
    extremely precise with great attention to details
    “examined it with microscopic care”
    Synonyms:
    precise
    sharply exact or accurate or delimited
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