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One possibility is a closed shape: a circle, ellipse, a closed wriggly shape.
Ellipse
Parallelogram prism
Planchet; flan (ancient coins)
coefficient
One possibility is a closed shape: a circle, ellipse, a closed wriggly shape.
Ellipse
equilibrium amplitude
Spotted , scuttle ; see relevant link below to more suggestions .
No not "a blank", it is called a "reservoir".
A+
yes
It is: the 'least common denominator'
it is called a blank
CERVETERI, an ancient Etruscan town.
Parallelogram prism
It should be "Blank Check". Added some links below.