Noun
English Wikipedia has an article on:steam distillationWikipedia
steam distillation (countable and uncountable, plural steam distillations)
(chemistry) A technique in which the volatile components of a material are separated by passing steam through the heated material
It is produced through a steam distillation process but can also be made quite easily at home. Source: Internet
The pure extract can only be made through steam distillation and is not generally suitable for DIY use. Source: Internet