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The Collaborative International Dictionary
Micrology

Micrology \Mi*crol"o*gy\, n. [Micro- + -logy.]

  1. That part of science which treats of microscopic objects, or depends on microscopic observation.

  2. Attention to petty items or differences.
    --W. Taylor.

Douglas Harper's Etymology Dictionary
micrology

"hair splitting, exaggerated attention to petty things," 1650s, from Greek mikrologia "pettiness, care for trifles," from micros (see micro-) + -logia (see -logy).

Wiktionary
micrology

n. 1 The study of triviality and minutiae. 2 That part of science which treats of microscopic objects, or depends on microscopic observation.