v. t. [ F. suostraire; L. subtus below (from sub under) + trahere to draw. See Substract. ] To subtract; to withdraw. [ Obs. ] Barrow. [ 1913 Webster ]

n. [ OF. substraction, F. soustraction. See Subtract. ] 1. Subtraction; deduction. [ Obs. ] [ 1913 Webster ]

2. (Law) See Subtraction, 3. [ 1913 Webster ]

n. 1. One who subtracts. [ 1913 Webster ]

2. A detractor; a slanderer. [ Obs. ] Shak. [ 1913 Webster ]

a. Having very slight furrows. [ R. ] [ 1913 Webster ]

n. A substratum. [ R. ] [ 1913 Webster ]

v. t. [ L. substratus, p. p. of substrahere. See Substratum. ] To strew or lay under anything. [ Obs. ] [ 1913 Webster ]

The melted glass being supported by the substrated sand. Boyle. [ 1913 Webster ]

n.; pl. Substrata [ L. substratus, p. p. of substernere to strew under; sub under + sternere to strew. See Stratum. ] 1. That which is laid or spread under; that which underlies something, as a layer of earth lying under another; specifically (Agric.), the subsoil. [ 1913 Webster ]

2. (Metaph.) The permanent subject of qualities or cause of phenomena; substance. [ 1913 Webster ]

v. t. [ See Substruction. ] To build beneath something; to lay as the foundation. [ R. ] [ 1913 Webster ]

He substructs the religion of Asia as the base. Emerson. [ 1913 Webster ]

n. [ L. substructio, fr. substruere, substructum, to build beneath; sub under + struere to build. ] (Arch.) Underbuilding; the foundation, or any preliminary structure intended to raise the lower floor or basement of a building above the natural level of the ground. [ 1913 Webster ]

It is a magnificent strong building, with a substruction very remarkable. Evelyn. [ 1913 Webster ]

n. [ Pref. sub- + structure. ] 1. (Arch.) Same as Substruction. [ 1913 Webster ]

2. An under structure; a foundation; groundwork. [ 1913 Webster ]