n. 金属手杖, 金属环, 套圈

vt. 装以金属箍

[医] 金属加固环

[ noun ]
a metal cap or band placed on a wooden pole to prevent splitting
<noun.artifact>

Ferrule \Fer"rule\ (f[e^]r"r[i^]l or f[e^]r"r[.u]l; 277), n.
[Formerly verrel, F. virole, fr. L. viriola little bracelet,
dim. of viriae, pl., bracelets; prob. akin to viere to twist,
weave, and E. withe. The spelling with f is due to confusion
with L. ferrum iron.] [Sometimes spelled {ferule}.]
1. A ring or cap of metal put round a cane, tool, handle, or
other similar object, to strengthen it, or prevent
splitting and wearing.

2. (Machinery) Any of various circular or cylindrical metal
objects used at joints in a tube, pipe, or rod, especially
to assist making a tight seal at a joint.
[PJC]

3. Hence: (Steam Boilers) A bushing for expanding the end of
a flue to fasten it tightly in the tube plate, or for
partly filling up its mouth.

4. Hence: (Chemistry) A bushing used at the joints of metal
tubing in HPLC equipment to make a tight seal.
[PJC]

5. (Fishing) One of several small rings at the top of a
casting rod which holds the fishing line. --RHUD
[PJC]

Thimble \Thim"ble\, n. [OE. thimbil, AS. ??mel, fr. ??ma a
thumb. [root]56. See {Thumb}.]
1. A kind of cap or cover, or sometimes a broad ring, for the
end of the finger, used in sewing to protect the finger
when pushing the needle through the material. It is
usually made of metal, and has upon the outer surface
numerous small pits to catch the head of the needle.

2. (Mech.) Any thimble-shaped appendage or fixure.
Specifically:
(a) A tubular piece, generally a strut, through which a
bolt or pin passes.
(b) A fixed or movable ring, tube, or lining placed in a
hole.
(c) A tubular cone for expanding a flue; -- called
{ferrule} in England.

3. (Naut.) A ring of thin metal formed with a grooved
circumference so as to fit within an eye-spice, or the
like, and protect it from chafing.