a floating platform on the sea for aircraft to land on and take off from
seadrome in American English
(ˈsiˌdroum)
noun
Aeronautics
a floating airdrome serving as an intermediate or emergency landing place for aircraft flying over water
Word origin
[1920–25; sea + -drome]This word is first recorded in the period 1920–25. Other words that entered Englishat around the same time include: Unknown Soldier, checkout, follow-up, fundamentalism, tie-in