There are a total of 50 9-letter words containing 'micro', and the number may vary in different dictionaries. You can specify the dictionary and order.

• microbars ₁₈
• microbeam ₂₁
• microbial ₁₉
• microblog ₂₁
• microbrew ₂₁
• microcars ₁₈
• microcell ₂₀
• microchip ₂₃
• microcode ₁₉
• microcopy ₂₃
• microcosm ₂₁
• microcyte ₂₀
• microdots ₁₆
• microfilm ₂₂
• microform ₂₁
• microglia ₁₈
• microgram ₂₀
• microinch ₂₁
• microlith ₁₈
• micromere ₁₈
• micromesh ₂₀
• micromhos ₂₀
• micromini ₁₉
• micromole ₁₉
• micronise ₁₆
• micronize ₂₅
• micropigs ₂₀
• micropore ₁₈
• micropsia ₁₈
• micropyle ₂₁
• microsite ₁₅
• microsome ₁₈
• microtome ₁₈
• microtone ₁₆
• microvolt ₂₀
• microwatt ₁₈
• microwave ₂₂
• semimicro ₁₈
• submicron ₂₀
• microbian ₁₅
• microdont ₁₄
• microfine ₁₆
• microloan ₁₃
• microtomy ₁₈
• microcard ₁₆
• microjets ₂₀
• microlite ₁₃
• micrology ₁₇
• micropump ₁₉
• microwire ₁₆

There are 50 9-letter words containing micro in the well-known word game dictionary, 37 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 46 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 39 in the Words with Friends (WWF) dictionary.