1. A short upper garment, extending downward to the hips; a short coat without skirts.
2. An outer covering for anything, esp. a covering of some nonconducting material such as wood or felt, used to prevent radiation of heat, as from a steam boiler, cylinder, pipe, etc.
3. Mil. In ordnance, a strengthening band surrounding and reënforcing the tube in which the charge is fired.
4. A garment resembling a waistcoat lined with cork, to serve as a life preserver; -- called also cork jacket.
Blue jacket. Naut. See under Blue.
Steam jacket, a space filled with steam between an inner and an outer cylinder, or between a casing and a receptacle, as a kettle.
To dust one's jacket, to give one a beating. [Colloq.]
Blue a. [Compar. Bluer superl. Bluest.]
1. Having the color of the clear sky, or a hue resembling it, whether lighter or darker; as, the deep, blue sea; as blue as a sapphire; blue violets. “The blue firmament.”
2. Pale, without redness or glare, -- said of a flame; hence, of the color of burning brimstone, betokening the presence of ghosts or devils; as, the candle burns blue; the air was blue with oaths.
3. Low in spirits; melancholy; as, to feel blue.
4. Suited to produce low spirits; gloomy in prospect; as, thongs looked blue. [Colloq.]
5. Severe or over strict in morals; gloom; as, blue and sour religionists; suiting one who is over strict in morals; inculcating an impracticable, severe, or gloomy mortality; as, blue laws.
6. Literary; -- applied to women; -- an abbreviation of bluestocking. [Colloq.]
The ladies were very blue and well informed. --Thackeray.
Blue asbestus. See Crocidolite.
Blue black, of, or having, a very dark blue color, almost black.
Blue blood. See under Blood.
Blue buck Zool., a small South African antelope (Cephalophus pygmæus); also applied to a larger species (Ægoceras leucophæus); the blaubok.
Blue cod Zool., the buffalo cod.
Blue crab Zool., the common edible crab of the Atlantic coast of the United States (Callinectes hastatus).
Blue curls Bot., a common plant (Trichostema dichotomum), resembling pennyroyal, and hence called also bastard pennyroyal.
Blue devils, apparitions supposed to be seen by persons suffering with delirium tremens; hence, very low spirits. “Can Gumbo shut the hall door upon blue devils, or lay them all in a red sea of claret?” --Thackeray.
Blue gage. See under Gage, a plum.
Blue gum, an Australian myrtaceous tree (Eucalyptus globulus), of the loftiest proportions, now cultivated in tropical and warm temperate regions for its timber, and as a protection against malaria. The essential oil is beginning to be used in medicine. The timber is very useful. See Eucalyptus.
Blue jack, Blue stone, blue vitriol; sulphate of copper.
Blue jacket, a man-of war's man; a sailor wearing a naval uniform.
Blue jaundice. See under Jaundice.
Blue laws, a name first used in the eighteenth century to describe certain supposititious laws of extreme rigor reported to have been enacted in New Haven; hence, any puritanical laws. [U. S.]
Blue light, a composition which burns with a brilliant blue flame; -- used in pyrotechnics and as a night signal at sea, and in military operations.
Blue mantle Her., one of the four pursuivants of the English college of arms; -- so called from the color of his official robes.
Blue mass, a preparation of mercury from which is formed the blue pill. --McElrath.
Blue mold or Blue mould, the blue fungus (Aspergillus glaucus) which grows on cheese. --Brande & C.
Blue Monday, (a) a Monday following a Sunday of dissipation, or itself given to dissipation (as the Monday before Lent). (b) a Monday considered as depressing because it is a workday in contrast to the relaxation of the weekend.
Blue ointment Med., mercurial ointment.
Blue Peter British Marine, a blue flag with a white square in the center, used as a signal for sailing, to recall boats, etc. It is a corruption of blue repeater, one of the British signal flags.
Blue pill. Med. (a) A pill of prepared mercury, used as an aperient, etc. (b) Blue mass.
Blue ribbon. (a) The ribbon worn by members of the order of the Garter; -- hence, a member of that order. (b) Anything the attainment of which is an object of great ambition; a distinction; a prize. “These [scholarships] were the --=\blue ribbon of the college.”\= --Farrar. (c) The distinctive badge of certain temperance or total abstinence organizations, as of the --Blue ribbon Army.
Blue ruin, utter ruin; also, gin. [Eng. Slang] --Carlyle.
Blue spar Min., azure spar; lazulite. See Lazulite.
Blue thrush Zool., a European and Asiatic thrush (Petrocossyphus cyaneas).
Blue verditer. See Verditer.
Blue vitriol Chem., sulphate of copper, a violet blue crystallized salt, used in electric batteries, calico printing, etc.
Blue water, the open ocean.
Big Blue, the International Business Machines corporation. [Wall Street slang.]
To look blue, to look disheartened or dejected.
True blue, genuine and thorough; not modified, nor mixed; not spurious; specifically, of uncompromising Presbyterianism, blue being the color adopted by the Covenanters.
For his religion . . .
'T was Presbyterian, true blue. --Hudibras.