trimmer arch: Meaning and Definition of

trim'mer arch"

Pronunciation: [key]
— Building Trades. Building Trades.
  1. an arch, usually of brick and in the form of half of a segmental arch, between a chimney and a header in a floor structure to support a hearth.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.