12
infinitesimal(adjective, smallness, littleness, microscopic)
8
atomic(adjective, smallness, littleness, microscopic)
6
microscopic(adjective, smallness)
6
subatomic(adjective, smallness, littleness, microscopic)
5
corpuscular(adjective, smallness, littleness)
5
inappreciable(smallness, littleness)
5
invisible
5
little(adjective, microscopic)
5
minute(noun, adjective, small, microscopic)
4
evanescent(smallness, littleness)
4
impalpable
4
imperceptible
3
embryonic
3
inconsiderable
3
insignificant
3
intangible
2
diminutive
2
least(noun, adjective, slightest, smallest)
2
molecule
2
small
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APASmart Define. (2015). molecular thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/molecular/thesaurus/synonyms
ChicagoSmart Define. 2015. "molecular thesaurus" https://smartdefine.org/molecular/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, molecular thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/molecular/thesaurus/synonyms>.
MLASmart Define. "molecular thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/molecular/thesaurus/synonyms>