Eleméntary. adj. [from elementary.] Uncompounded; having only one principle or constituent part.
All rain water contains in it a copious sediment of terrestrial matter, and is not a simple elementary water. Ray on the Creat.
The elementary salts of animals are not the same as they appear by distillation. Arbuthnot on Aliments.

In later editions, the etymology was corrected to read:
[from element.]