A small or trivial detail. She noticed a minutia in the painting that everyone else had missed.
(nonstandard, uncountable) Small, precise, or trivial details considered collectively. Let's not get bogged down in the minutia and lose sight of the bigger picture.
(biometrics) A ridge ending, bifurcation, or other characteristic point on a fingerprint used for identification. The software detects each minutia to generate a unique fingerprint template.