Of, pertaining to, or characteristic of Noah Webster (1758-1843), American lexicographer and spelling reformer.

(biology) Diverging from, or lacking conformity to, a type.

(chemistry) Initialism of hydrogen cyanide. / (numbers) Initialism of highly composite number.

(usually clothing) Initialism of large (of the manufactured size). / Initialism of left. / (linguistics) Initialism of low (variety of a language with limited prestige and official acceptance).