【医】 加拿大铁杉

Pitch \Pitch\, n. [OE. pich, AS. pic, L. pix; akin to Gr. ?.]
1. A thick, black, lustrous, and sticky substance obtained by
boiling down tar. It is used in calking the seams of
ships; also in coating rope, canvas, wood, ironwork, etc.,
to preserve them.

He that toucheth pitch shall be defiled therewith.
--Ecclus.
xiii. 1.

2. (Geol.) See {Pitchstone}.

{Amboyna pitch}, the resin of {Dammara australis}. See
{Kauri}.

{Burgundy pitch}. See under {Burgundy}.

{Canada pitch}, the resinous exudation of the hemlock tree
({Abies Canadensis}); hemlock gum.

{Jew's pitch}, bitumen.

{Mineral pitch}. See {Bitumen} and {Asphalt}.

{Pitch coal} (Min.), bituminous coal.

{Pitch peat} (Min.), a black homogeneous peat, with a waxy
luster.

{Pitch pine} (Bot.), any one of several species of pine,
yielding pitch, esp. the {Pinus rigida} of North America.


Hemlock \Hem"lock\, n. [OE. hemeluc, humloc, AS. hemlic,
hymlic.]
1. (Bot.) The name of several poisonous umbelliferous herbs
having finely cut leaves and small white flowers, as the
{Cicuta maculata}, {Cicuta bulbifera}, and {Cicuta
virosa}, and the {Conium maculatum}. See {Conium}.

Note: The potion of hemlock administered to Socrates is by
some thought to have been a decoction of {Cicuta
virosa}, or water hemlock, by others, of {Conium
maculatum}.

2. (Bot.) An evergreen tree common in North America ({Abies
Canadensis} or {Tsuga Canadensis}); hemlock spruce.

The murmuring pines and the hemlocks. --Longfellow.

3. The wood or timber of the hemlock tree.

{Ground hemlock}, or {Dwarf hemlock}. See under {Ground}.