English
sedimentary
From sediment + -ary.
A compound of sediment + -ary
Proto-Indo-European *sed- ‘to sit’
…
Proto-Italic *sedēō ‘to sit, to be sitting, to be seated’
Latin sedeō ‘to sit’
Latin sedimentum ‘a settling, sinking down, subsidence’
Middle French sédiment
English sediment
Today it means
adj Made by the deposition and compression of small particles.
Language periods are conventional ranges, not dates for this word.
Etymograph / sedimentary