noun, noun which may take the genitive case particle 'no'
outermost side; outermost layer
Technical term used in geometry, anatomy, engineering, and similar fields to describe the furthest outward part or surface of something.
この構造の最外側には保護膜がある。
There is a protective film on the outermost side of this structure.
最外側の層を取り除いてください。
Please remove the outermost layer.
Antonym meaning 'innermost side'.
Compound of 最 (sai, 'most') + 外側 (gaisoku, 'outside'). The reading がいそく for 外側 is a less common but valid on'yomi-based reading, often used in technical compounds.