椭圆规

ellipsograph【测】;elliptic trammels【测】;trammels【测】

elliptic function filter

second-order elliptic system【数】

double elliptic geometry【数】

elliptic partial differential equation【数】

three-quarter elliptic spring

incomplete elliptic integral【数】

elliptic function field【数】;field of elliptic function【数】