ultrafine

ultrafine

(ˈʌltrəˌfaɪn; ˌʌltrəˈfaɪn) adj1. extremely small or delicate2. (Metallurgy) (of metals) having an extremely high level of purity

ul•tra•fine

(ˌʌl trəˈfaɪn)
adj. too small to be visible under a light microscope: ultrafine cell structure. [1955–60]
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