IPA: /ˈmɪnɪskjuːl/
KK: /ˈmɪnɪˌskjul/
Very small or tiny in size or amount.
The miniscule details in the painting were hard to see without a magnifying glass.
Miniscule is derived from "minuscule" (from Latin "minusculus", meaning smaller or lesser), which itself comes from "minus" (meaning less). The word refers to something that is very small or tiny.
Think of 'less' ('minus') to remember that 'miniscule' means something very small.