fluctuant
adjective
fluc·tu·ant ˈflək-chə-wənt 
-chü-ənt
1
: moving in waves
2
: variable, unstable
3
: being movable and compressible
a fluctuant abscess
Example Sentences
Recent Examples on the Web Going forward, Thomas sees his starting quarterback as a fluctuant decision. 
Theo Mackie, The Arizona Republic, 6 Nov. 2021
Theo Mackie, The Arizona Republic, 6 Nov. 2021 Word History
First Known Use
1560, in the meaning defined at sense 1
Medical Definition
fluctuant
adjective
fluc·tu·ant ˈflək-chə-wənt
: movable and compressible —used of abnormal body structures (as some abscesses or tumors)
the fluctuant mass in his abdomen Oliver Sacks
Oliver Sacks