Fixed

a. 1. Securely placed or fastened; settled; established; firm; imovable; unalterable. [ 1913 Webster ]

2. (Chem.) Stable; non-volatile. [ 1913 Webster ]

Fixed air (Old Chem.), carbonic acid or carbon dioxide; -- so called by Dr. Black because it can be absorbed or fixed by strong bases. See Carbonic acid, under Carbonic. --
Fixed alkali (Old Chem.), a non-volatile base, as soda, or potash, in distinction from the volatile alkali ammonia. --
Fixed ammunition (Mil.), a projectile and powder inclosed together in a case ready for loading. --
Fixed battery (Mil.), a battery which contains heavy guns and mortars intended to remain stationary; -- distinguished from movable battery. --
Fixed bodies, those which can not be volatilized or separated by a common menstruum, without great difficulty, as gold, platinum, lime, etc. --
Fixed capital. See the Note under Capital, n., 4. --
Fixed fact, a well established fact. [ Colloq. ] --
Fixed light, one which emits constant beams; -- distinguished from a flashing, revolving, or intermittent light. --
Fixed oils (Chem.), non-volatile, oily substances, as stearine and olein, which leave a permanent greasy stain, and which can not be distilled unchanged; -- distinguished from volatile or essential oils. --
Fixed pivot (Mil.), the fixed point about which any line of troops wheels. --
Fixed stars (Astron.), such stars as always retain nearly the same apparent position and distance with respect to each other, thus distinguished from planets and comets. [ 1913 Webster ]