Any engine that generates thrust by expelling matter, especially hot gases produced by igniting a fuel; either a rocket engine or several types of jet engine.

Affected with tuberculosis.

(inorganic chemistry) Any anion derived from beryllate by replacing an oxygen atom with two of fluorine, but especially the anion BF₄²⁻; any salt containing such an anion

(anatomy) Relating to the cerebrum and the cranium