noun
1. or boiler iron : flat-rolled steel usually about a quarter to a half inch thick used especially for making boilers and tanks and for covering ships
2.
a. : syndicated material supplied especially to weekly newspapers in matrix or plate form
b. : hackneyed or unoriginal writing
3.
a. : a relatively smooth surface (as of flush or overlapping slabs of rock) on a cliff affording little or no foothold
b. : a frozen crusty surface of snow