airlock
UK[ˈeəlɒk]US[ˈerlɑːk]
n
A sealed chamber with two airtight doors that allows passage between spaces of different air pressures, especially between a spacecraft and outer space or between a sterile environment and a non-sterile one.
n
A bubble of air blocking the flow of liquid in a pipe or pump.
Morpheme Breakdown
air
lock
air
lock
Etymology
The compound noun 'airlock' is a modern formation from two ancient roots. 'Air' descends from the Greek aēr, meaning the lower atmosphere or mist, which passed into Latin and then into the European vernaculars. 'Lock' originates from the Old English loc, referring to a fastening, bar, or enclosed space. The term was logically coined in the 19th and 20th centuries to describe a technological device that literally "locks in" or secures a specific atmospheric condition, preventing the uncontrolled exchange of air between two adjacent spaces. Its primary application in spacecraft and controlled environments perfectly illustrates the functional combination of its constituent meanings: a sealed enclosure for managing air pressure.
Analysis
Structure: air + lock
- air (Origin: Middle English, from Old French air, from Latin āēr, from Greek aēr (air, mist). Role: The core semantic root, denoting the gaseous substance.)
- lock (Origin: Old English loc (fastening, enclosure). Role: The core semantic root, denoting a mechanism for securing or enclosing something.)
Examples
The astronauts waited in the airlock before their spacewalk.
A small airlock is used in laboratories to transfer materials into a cleanroom.
We need to bleed the airlock in the central heating system to restore proper circulation.