Plain English Meaning
Like jelly — soft, thick, and wobbly, somewhere between a liquid and a solid.
Full Definition
Having the thick, jelly-like consistency of a soft, semi-solid substance that holds its shape but flows when disturbed.
Context Anchor
Seen in instrument flying discussions of the ear, balance, and why the body can give a pilot misleading motion sensations without outside visual references.
Derivation
From Latin gelatus, meaning 'frozen' or 'set.' The same root gives us 'gelatin' — the wobbly substance in jelly desserts. The word describes anything with that thick, semi-solid texture.
Why Pilots Care
The gelatinous fluid in the inner ear is what makes spatial disorientation possible. When this fluid lags behind head or body movement, the brain can be tricked into sensing motion that is not happening — or missing motion that is. Understanding the physical nature of this fluid helps pilots understand why illusions like occur.