(music) A superposition of sine waves, separated by an octave, whose relative amplitude may be varied to give the illusion of a rising or falling note.

(algebra, dated) A ring in which every nonzero element has a multiplicative inverse; division ring

(crystallography) The trapezohedron or tetragonal trisoctahedron, the form of the mineral leucite.

Suffocating with heat; oppressively hot; sultry.