Subnormal may refer to: Subnormal body temperature, a common term for hypothermia Subnormal operator, a type of operator in operator theory in mathematics Subnormal number, another name for a denormal number in floating point arithmetic Subnormal profit, which is negative profit (economics) Subnormal series, a type of subgroup series in group theory in mathematics Subnormal subgroup, a type of subgroup in group theory in mathematics The projection of a normal of a curve onto the x-axis; see subtangent