A plant with narrow, leathery, pointed leaves, Sansevieria trifasciata, recently also known as Dracaena trifasciata, often grown as a houseplant for its distinctive foliage and its tolerance of low light. The leaves are also the source of a tough fiber used for rope.

(optics) A law stating that the radiant intensity or luminous intensity observed from an ideal diffusely reflecting surface or ideal diffuse radiator is directly proportional to the cosine of the angle between the direction of the incident light and the surface normal.

an economic law that claims a good must sell for the same price in all locations

plural of mother-in-law sandwich

(science fiction, robotics) One of the Three Laws of Robotics, requiring a robot to protect its own existence, as long as this does not conflict with the First Law (which forbids a robot to harm a human) or the Second Law (which requires robots to obey humans).

(science fiction, robotics) One of the Three Laws of Robotics, requiring a robot to obey humans, unless it would conflict with the First Law of Robotics (which forbids a robot to harm a human).

(science fiction, robotics) One of the Three Laws of Robotics, forbidding a robot to harm a human, through either action or inaction.

A rumble seat in an automobile.

plural of mother-in-law seat

plural of civil law notary