noun Date: 1851 an intermediate chamber with two airtight doors or openings to permit passage between two dissimilar spaces (as two places of unequal atmospheric pressure), a stoppage of flow caused by air being in a part where liquid ought to circulate
AIR LOCK
Meaning of AIR LOCK in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012