Anagrams of: OBSTRUCTIONAL

• an arithmetic operation in which the difference between two numbers is calculated

• the act of subtracting (removing a part from the whole)

• The state of being obscured.

• A unit of measurement used in particular for smoke detectors which respond to absorption of light by smoke, in percent absorption per unit length, e.g. % obs/ft, % obs/m.

• (plural) an optical instrument designed for simultaneous use by both eyes

• apparatus consisting of a box designed to maintain a constant temperature by the use of a thermostat; used for chicks or premature infants

• a substance capable of reducing friction by making surfaces smooth or slippery

• a substance capable of reducing friction by making surfaces smooth or slippery

• apparatus consisting of a box designed to maintain a constant temperature by the use of a thermostat; used for chicks or premature infants

• relating to both eyes

• relating to or consisting of or yielding carbon