undersheathing

sheathing

[shee-thing]
noun
1.
the act of a person who sheathes.
2.
something that sheathes; a covering or outer layer of metal, wood, or other material, as one of metal plates on a ship's bottom, the first covering of boards on a house, etc.
3.
material for forming any such covering.

Origin:
1490–1500; sheathe + -ing1

undersheathing, noun
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World English Dictionary
sheathing (ˈʃiːðɪŋ)
 
n
1.  any material used as an outer layer, as on a ship's hull
2.  boarding, etc, used to cover the wall studding or roof joists of a timber frame

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

sheath
O.E. sceað, scæð, from P.Gmc. *skaithiz (cf. O.S. scethia, O.N. skeiðir (pl.), O.Fris. skethe, M.Du. schede, Du. schede, O.H.G. skaida, Ger. scheide "scabbard"), possibly from base *skaith "divide, split" (see shed (v.)) on notion of a split stick with the
sword blade inserted. Meaning "condom" is recorded from 1861; sense of "close-fitting dress or skirt" is attested from 1904.

sheathe
c.1400, "to furnish (a sword, etc.) with a sheath," from sheath (q.v.); meaning "to put (a sword, etc.) in a sheath" is attested from c.1430.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

sheath (shēth)
n. pl. sheaths (shēðz, shēths)
An enveloping tubular structure, such as the tissue that encloses a muscle or nerve fiber.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
sheath   (shēth)  Pronunciation Key 
An enveloping tubular structure, such as the base of a grass leaf that surrounds the stem or the tissue that encloses a muscle or nerve fiber.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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