Etymology

microbeam

M3I1C3R1O1B3E1A1M3

Today it means: A beam having a small cross section Full definition →

English beam ← Middle English bem ← Old English bēam
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The story

  1. Englishmicro-
  2. Proto-Germanic*bagmaz?
  3. Proto-West Germanic*baum
  4. Old Englishbēam
  5. Middle Englishbem
  6. Englishbeam
  7. English todaymicrobeam

From micro- + beam.

Etymology from Wiktionary, CC BY-SA 4.0.