(Canada, US) A pencil with a replaceable and mechanically extendable lead that wears away with use, designed to provide lines of constant thickness without requiring sharpening, and typically featuring a small eraser at the end opposite the tip.

Alternative form of quantum mechanical

Of or pertaining to quantum mechanics.

plural of auto mechanic

(US) A person skilled in repairing and maintaining automobiles and other motor vehicles.

(biology) The breaking of food into digestible chunks, normally using the teeth.

Alternative spelling of servomechanism

Infantry which is transported in mechanized vehicles but still fights on foot.

plural of mechanical energy

(psychology) A psychological strategy used unconsciously by people to cope with harmful or stressful situations. / (evolutionary biology) An automatic reaction of the body against foreign antibodies.