(ˌ)səb¦stanch(ē)əˌjelət ə nˈōsə, -ˈōzə noun
Etymology: New Latin, literally, gelatinous substance
: a mass of gelatinous tissue that lies on the dorsal surface of the dorsal column and extends the entire length of the spinal cord into the medulla oblongata and that functions in the transmission of painful sensory information