A term used in scientific contexts to describe extremely small particles or features, often in nanotechnology or materials science.

अत्यधिक सूक्ष्म

English Usage: The ultramicro particles were difficult to observe with standard laboratory equipment.

Hindi Usage: अत्यधिक सूक्ष्म कणों को मानक प्रयोगशाला उपकरणों से देखना मुश्किल था।