The term PERSPIRATION UNIT is composed of two words, BEAD and UNIT. BEAD is a four-letter word meaning a small, round object made from glass, wood, plastic, or other material, with a hole through the middle so it can be strung on a thread or wire. UNIT is a four-letter word meaning a single thing, person, or group forming part of a larger whole. Together, the two words form the term PERSPIRATION UNIT, which refers to a device used to measure the amount of sweat produced by a person's body.