# tridiagonal

> English word · Adjective

## Definitions
1. Having nonzero elements only in the main diagonal and the diagonals directly above and below it.

## Etymology
From tri- + diagonal.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/tridiagonal