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The Collaborative International Dictionary of English v.0.48 (gcide)

Leach \Leach\, n. (Naut.)
See 3d {Leech}.
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Leach \Leach\, n. [Written also {letch}.] [Cf. As. le['a]h lye,
G. lauge. See {Lye}.]
1. A quantity of wood ashes, through which water passes, and
thus imbibes the alkali.
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2. A tub or vat for leaching ashes, bark, etc.
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{Leach tub}, a wooden tub in which ashes are leached.
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Leach \Leach\, v. t. [imp. & p. p. {Leached}; p. pr. & vb. n.
{Leaching}.] [Written also leech and letch.]
1. To remove the soluble constituents from by subjecting to
the action of percolating water or other liquid; as, to
leach ashes or coffee.
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2. To dissolve out; -- often used with out; as, to leach out
alkali from ashes.
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Leach \Leach\, v. i.
To part with soluble constituents by percolation.
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Leach \Leach\, n.
See {Leech}, a physician. [Obs.]
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Leech \Leech\, n. [Cf. LG. leik, Icel. l[imac]k, Sw. lik
boltrope, st[*a]ende liken the leeches.] (Naut.)
The border or edge at the side of a sail. [Written also
{leach}.]
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{Leech line}, a line attached to the leech ropes of sails,
passing up through blocks on the yards, to haul the
leeches by. --Totten.

{Leech rope}, that part of the boltrope to which the side of
a sail is sewed.
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Leech \Leech\, n. [OE. leche, l[ae]che, physician, AS. l[=ae]ce;
akin to Fries. l[=e]tza, OHG. l[=a]hh[imac], Icel.
l[ae]knari, Sw. l[aum]kare, Dan. l[ae]ge, Goth. l[=e]keis,
AS. l[=a]cnian to heal, Sw. l[aum]ka, Dan. l[ae]ge, Icel.
l[ae]kna, Goth. l[=e]kin[=o]n.]
1. A physician or surgeon; a professor of the art of healing.
[Written also {leach}.] [Archaic] --Spenser.
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Leech, heal thyself. --Wyclif (Luke
iv. 23).

2. (Zool.) Any one of numerous genera and species of annulose
worms, belonging to the order {Hirudinea}, or Bdelloidea,
esp. those species used in medicine, as {Hirudo
medicinalis} of Europe, and allied species.
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Note: In the mouth of bloodsucking leeches are three
convergent, serrated jaws, moved by strong muscles. By
the motion of these jaws a stellate incision is made in
the skin, through which the leech sucks blood till it
is gorged, and then drops off. The stomach has large
pouches on each side to hold the blood. The common
large bloodsucking leech of America ({Macrobdella
decora}) is dark olive above, and red below, with black
spots. Many kinds of leeches are parasitic on fishes;
others feed upon worms and mollusks, and have no jaws
for drawing blood. See {Bdelloidea}. {Hirudinea}, and
{Clepsine}.
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3. (Surg.) A glass tube of peculiar construction, adapted for
drawing blood from a scarified part by means of a vacuum.
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{Horse leech}, a less powerful European leech ({H[ae]mopis
vorax}), commonly attacking the membrane that lines the
inside of the mouth and nostrils of animals that drink at
pools where it lives.
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