Barometer.
The instrument used for measuring pressure is called a manometer.
A term for a sailor that starts with "mar" is "mariner."
A manometer is used to measure pressure. It typically consists of a U-shaped tube filled with fluid that responds to changes in pressure by moving the fluid levels.
"Tide" or a faster wave would be a "White cap"
Another name for the eustachian tube is the auditory tube. It connects the middle ear to the nasopharynx and helps equalize pressure between the middle ear and the environment.
A pluviometer is another name for a rain gauge.
Another name for unit pressure is pressure intensity.
sphignomameter
The instrument used for measuring pressure is called a manometer.
Atmosphere
intriguing
Their is not another name for HIV that starts with an R. That said, HIV is a type of retrovirus. That is probably the word you are looking for.
Another name of a dog house is a kennel.
Rubella is another name for German measles.
Gaucho?
brew
S.o.s