any device that receives a signal or stimulus (as heat or pressure or light or motion etc.) and responds to it in a distinctive manner
an abstract part of something
an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system
the perception that something has occurred or some state exists
any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
the most favorable environment for a plant or animal
a straight line that generates a cylinder or cone
becoming aware of something via the senses
the situation in which you are happiest and most effective
