† leastingn.
Origin: Formed within English, by derivation. Etymons: least adj., -ing suffix3.
Etymology: < least adj. + -ing suffix3.
Obsolete.
rare.
the world > matter > chemistry > atomic chemistry > [noun] > atoms
1674 N. Fairfax ii. 30 If it be but in one atome or leasting in the body, then a child would have more soul to its body than a man.
This entry has been updated (OED Third Edition, June 2018).