Definify.com
Webster 1913 Edition
Dab
Dab
(dăb)
, Noun.
 [Perh. corrupted fr. 
adept
.] A skillful hand; a dabster; an expert. 
[Colloq.] 
One excels at a plan or the titlepage, another works away at the body of the book, and the third is a 
  dab 
at an index. Goldsmith.
Dab
,Noun.
 [Perh. so named from its quickness in diving beneath the sand. Cf. 
Dabchick
.] (Zool.) 
A name given to several species of flounders, esp. to the European species, 
 Pleuronectes limanda
. The American rough dab is Hippoglossoides platessoides
. Dab
(dăb)
, Verb.
 I.
 [
imp. & p. p. 
Dabbed 
(dăbd)
; p. pr. & vb. n. 
Dabbing
.] [OE. 
dabben 
to strice; akin to OD. dabben 
to pinch, knead, fumble, dabble, and perh. to G. tappen 
to grope.] 1. 
To strike or touch gently, as with a soft or moist substance; to tap; hence, to besmear with a dabber. 
A sore should . . . be wiped . . . only by 
dabbing 
it over with fine lint. S. Sharp.
2. 
To strike by a thrust; to hit with a sudden blow or thrust. 
“To dab him in the neck.” Sir T. More.
 Dab
,Noun.
 1. 
A gentle blow with the hand or some soft substance; a sudden blow or hit; a peck. 
A scratch of her claw, a 
dab 
of her beak. Hawthorne.
2. 
A small mass of anything soft or moist. 
Webster 1828 Edition
Dab
DAB
, v.t.1.
  To strike gently with the hand; to slap; to box.2.
  To strike gently with some soft or moist substance; as, to dab a sore with lint.DAB
, n.1.
  A gentle blow with the hand.2.
  A small lump or mass of any thing soft or moist.3.
  Something moist or slimy thrown on one.4.
  In law language, an expert man.[See Dabster.]5.
  A small flat fish, of the genus Pleuronectes, of a dark brown color.