Third-person singular simple present indicative form of jill off

(archaic) The evil eye.

A rare disease of the lungs and airways where the trachea and bronchi become abnormally wide, leading to sputum collection in the lungs and repeated chest infections and bronchiectasis.

(chemistry) monatomic hydrogen that exists transiently after the reduction of a hydrogen ion; generated from zinc and hydrochloric acid; it is a strong reducing agent