fluctuant

adjective
fluc·​tu·​ant | \ˈflək-chə-wənt, -chü-ənt\

Definition of fluctuant 

1 : moving in waves

3 : being movable and compressible a fluctuant abscess

First Known Use of fluctuant

1560, in the meaning defined at sense 1

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The first known use of fluctuant was in 1560

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fluctuant

adjective
fluc·​tu·​ant | \ˈflək-chə-wənt \

Medical Definition of fluctuant 

: movable and compressible used of abnormal body structures (as some abscesses or tumors) the fluctuant mass in his abdomen— Oliver Sacks

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