What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
Definition of ferrihydrite in English:
ferrihydrite
noun
An iron-containing mineral, typically occurring as rust-brown aggregates of microscopic particles, which occurs widely in wet, iron-rich environments and is also present in the iron-storage protein ferritin.
Origin
1970s. After Russian ferrigidrit.
