Dartrous diathesis, A morbid condition of the system predisposing to the development of certain skin diseases, such as eczema, psoriasis, and pityriasis. Also called rheumic diathesis, and herpetism. Piffard.

(Dar*win"i*an) a. [From the name of Charles Darwin, an English scientist.] Pertaining to Darwin; as, the Darwinian theory, a theory of the manner and cause of the supposed development of living things from certain original forms or elements.

This theory was put forth by Darwin in 1859 in a work entitled "The Origin of species by Means of Natural Selection." The author argues that, in the struggle for existence, those plants and creatures best fitted to the requirements of the situation in which they are placed are the ones that will live; in other words, that Nature selects those which are to survive. This is the theory of natural selection or the survival of the fittest. He also argues that natural selection is capable of modifying and producing organisms fit for their circumstances. See Development theory, under Development.

(Dar*win"i*an), n. An advocate of Darwinism.

(Dar*win"i*an*ism) n. Darwinism.

(Dar"win*ism) n. (Biol.) The theory or doctrines put forth by Darwin. See above. Huxley.

(Dase) v. t. See Daze. [Obs.] Chaucer.

(Dase"we) v. i. [OE. dasewen, daswen; cf. AS. dysegian to be foolish.] To become dim- sighted; to become dazed or dazzled. [Obs.] Chauscer.

(Dash) v. t. [imp. & p. p. Dashed ; p. pr. & vb. n. Dashing.] [Of. Scand. origin; cf. Dan daske to beat, strike, Sw. & Icel. daska, Dan. & Sw. dask blow.]

1. To throw with violence or haste; to cause to strike violently or hastily; — often used with against.

If you dash a stone against a stone in the botton of the water, it maketh a sound.

1. One who darts, or who throw darts; that which darts.

2. (Zoöl.) The snakebird, a water bird of the genus Plotus; — so called because it darts out its long, snakelike neck at its prey. See Snakebird.

3. (Zoöl.) A small fresh-water etheostomoid fish. The group includes numerous genera and species, all of them American. See Etheostomoid.

(Dart"ing*ly) adv. Like a dart; rapidly.

(Dar"tle) v. t. & i. To pierce or shoot through; to dart repeatedly: — frequentative of dart.

My star that dartles the red and the blue.
R. Browning.

(Dar*to"ic) a. (Anat.) Of or pertaining to the dartos.

(Dar"toid) a. [Dartos + - oid.] (Anat.) Like the dartos; dartoic; as, dartoid tissue.

(||Dar"tos) n. [NL., fr. Gr. flayed.] (Anat.) A thin layer of peculiar contractile tissue directly beneath the skin of the scrotum.

(Dar"trous) a. [F. dartreux. See Dartars.] (Med.) Relating to, or partaking of the nature of, the disease called tetter; herpetic.

  By PanEris using Melati.

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