boil-off

noun

1. Rocketry. any vapor loss from the oxidizer or fuel in a rocket during countdown.
2. Also called boil·ing-off [boi-ling-awf, –of] /ˈbɔɪ lɪŋˈɔf, -ˈɒf/. Textiles.
   1. the process of degumming silk.
   2. the process of removing sizing, wax, impurities, etc., from fabric by scouring.