Defective may refer to:: *

Defective matrix In linear algebra, a defective matrix is a square matrix that does not have a complete basis of eigenvectors, and is therefore not diagonalizable. In particular, an ''n'' × ''n'' matrix is defective if and only if it does not have ...

, in algebra * Defective verb, in linguistics *Defective, or ''haser'', in Hebrew orthography, a spelling variant that does not include

mater lectionis ''Matres lectionis'' (from Latin "mothers of reading", singular form: ''mater lectionis'', from he, אֵם קְרִיאָה ) are consonants that are used to indicate a vowel, primarily in the writing down of Semitic languages such as Arabic, ...

*Something presenting an anomaly, such as a product defect, making it nonfunctional

See also