microdiaphragm means A very small diaphragm. Lexicurio rates it Rare gem — a strength score of 82 out of 100.
Etymology
From micro- + diaphragm.
noun
- A very small diaphragm.“A microdiaphragm having an adjustable aperture between 0.5 and 1,000 μm comprising: a pair of separate diaphragm strips, each of said diaphragm strips comprising two plates, […]”