Under-seam

noun

the line formed by sewing together pieces of cloth, leather, or the like.

the stitches used to make such a line.

any line formed by abutting edges.

any linear indentation or mark, as a wrinkle or scar.

Knitting. a line of stitches formed by purling.

Geology. a comparatively thin stratum; a bed, as of coal.

verb (used with object)

to join with or as if with stitches; make the seam or seams of.

to furrow; mark with wrinkles, scars, etc.

Knitting. to knit with or in a seam.

00:10

Under-seam is always a great word to know.

So is doohickey. Does it mean:

a gadget; dingus; thingumbob.

a scrap or morsel of food left at a meal.

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verb (used without object)

10.

to become cracked, fissured, or furrowed.

11.

Knitting. to make a line of stitches by purling.

Origin:
before 1000; Middle English seme (noun), Old English sēam; cognate with German Saum hem; akin to sew¹, Greek hymḗn membrane (see hymen)

Related forms

seam·er, noun

un·der·seam, noun

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To under-seam

Collins

World English Dictionary

seam (siːm)

—n
1.	the line along which pieces of fabric are joined, esp by stitching
2.	a ridge or line made by joining two edges
3.	a stratum of coal, ore, etc
4.	a linear indentation, such as a wrinkle or scar
5.	surgery another name for suture
6.	(modifier) cricket of or relating to a style of bowling in which the bowler utilizes the stitched seam round the ball in order to make it swing in flight and after touching the ground: a seam bowler
7.	bursting at the seams full to overflowing
8.	dialect (Northern English) in a good seam doing well, esp financially

—vb
9.	(tr) to join or sew together by or as if by a seam
10.	(US) to make ridges in (knitting) using purl stitch
11.	to mark or become marked with or as if with a seam or wrinkle

[Old English; related to Old Norse saumr, Old High German soum]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline

Word Origin & History

seam

O.E. seam, from P.Gmc. *saumaz (cf. O.N. saumr, O.H.G. soum, Ger. Saum), from PIE base *siw-/*sju- "to sew" (cf. O.E. siwian, L. suere, Skt. syuman; see sew).

"Chidynge and reproche vnsowen the semes of freendshipe in mannes herte." [Chaucer, "Parson's Tale," c.1386]

Meaning "raised band of stitching on a ball" is recorded from 1888. Geological use is from 1592. Seamless in fig. sense of "whole, integrated" is attested from 1862.

American Heritage

Science Dictionary

seam

(sēm) Pronunciation Key
A thin layer or stratum, as of coal or rock.

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