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and-aft sail, bent to a gaff, and hoisted on a lower mast or on a small mast, called the trysail mast, close abaft a lower mast; -- used chiefly as a storm sail. Called also spencer. Totten.

An appointment to meet; also, an appointed place or time of meeting; as, to keep tryst; to break tryst. [Scot. or Poetic] To bide tryst, to wait, at the appointed time, for one with whom a tryst or engagement is made; to keep an engagement or appointment. The tenderest-hearted maid That ever bided tryst at village stil…

One who makes an appointment, or tryst; one who meets with another.

An appointment; a tryst. Trysting day, an arranged day of meeting or assembling, as of soldiers, friends, and the like. And named a trysting day, And bade his messengers ride forth East and west and south and north, To summon his array. Macaulay. -- Trysting place, a place designated for the assembling of soldiers, the…

A white crystalline solid, from ammonia by replacement of an equivalent of hydrogen by acetyl.

A crystalline ketone, CH3COC6H5, which may be obtained by the dry distillation of a mixture of the calcium salts of acetic and benzoic acids. It is used as a hypnotic under the name of hypnone.

dlelike or bristlelike spines or prickles of some animals and plants; also, a needlelike crystal.

Needle-shaped; slender like a needle or bristle, as some leaves or crystals; also, having sharp points like needless. A*cic"u*lar*ly, adv.

A crystalline substance, C9H13O3N, obtained from suprarenal extract, of which it is regarded as the active principle. It is used in medicine as a stimulant and hemostatic.

A semipellucid, uncrystallized variety of quartz, presenting various tints in the same specimen. Its colors are delicately arranged in stripes or bands, or blended in clouds.

A white crystalline base, C3H7NO2, derived from aldehyde ammonia.

A white crystalline resinous substance extracted from gutta- percha by the action of alcohol or ether.

A mineral of the feldspar family, triclinic in crystallization, and in composition a silicate of alumina and soda. It is a common constituent of granite and of various igneous rocks. See Feldspar.

A crystallizable compound of a salt with alcohol, in which the latter plays a part analogous to that of water of crystallization. Graham.

A crystalline, transparent, colorless substance found in the allantoic liquid of the fetal calf; -- formerly called allantoic acid and amniotic acid.

Variability in chemical constitution without variation in crystalline form.

Any one of two or more distinct crystalline forms of the same substance; or the substance having such forms; -- as, carbonate of lime occurs in the allomorphs calcite and aragonite.

A crystalline derivative of salicylic acid, used as an antiseptic and antirheumatic.

element (esp. an alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization.

A characteristic crystalline substance, obtained from oil of bitter almonds.