heptadiagonal

== English == === Etymology === From hepta- +‎ diagonal. === Adjective === heptadiagonal (not comparable) (of a matrix) Having nonzero entries along the main diagonal, the three diagonals on either side of the main diagonal, and the three diagonals near each corner, only. ==== Quotations ==== For quotations using this term, see Citations:heptadiagonal.