(obsolete) Envy; hatred.

Britain standard spelling of niter.

(organic chemistry) The ester of isoamyl alcohol and nitrous acid, a volatile yellow liquid used as a vasodilator and antidote to cyanide poisoning; used illicitly as a sexual stimulant.

(pharmacology) A yellowish volatile synthetic liquid C₅H₁₁NO₂ of commercial amyl alcohol and nitrous acid that is used medicinally as a vasodilator. It is rapidly absorbed by the body on inhalation, and is sometimes used recreationally especially as an aphrodisiac.

(chemistry) A compound of nitrogen where nitrogen has an oxidation state of −3.

(transitive) To subject to the nitriding process.

Alternative form of knitch (“a small bundle”)

(dialectal) A notch or small incision.

Misspelling of niche.

(chemistry) an insoluble binary compound or uranium and nitrogen, (UN)ₙ, used as fuel rods in nuclear reactors