n. 1. compound lens or lens system designed to be free of astigmatism and able to form approximately point images. [ WordNet 1.5 ]

a. [ Pref. an-not + astigmatic. ] (Optics) Not astigmatic; free of astigmatism; -- pertaining to a lens or lens system, and used especially of a lens system which consists of a converging lens and a diverging lens of equal and opposite astigmatism but different focal lengths, and sensibly free from astigmatism. [ Webster 1913 Suppl. + WordNet 1.5 ]

a. (Med. & Opt.) Affected with, or pertaining to, astigmatism; as, astigmatic eyes; also, remedying astigmatism; as, astigmatic lenses. [ 1913 Webster ]

n. [ Gr. 'a priv. + &unr_;, &unr_;, a prick of a pointed instrument, a spot, fr. &unr_; to prick: cf. F. astigmatisme. ] (Med. & Opt.) A defect of the eye or of a lens, in consequence of which the rays derived from one point are not brought to a single focal point, thus causing imperfect images or indistinctness of vision. [ 1913 Webster ]

☞ The term is applied especially to the defect causing images of lines having a certain direction to be indistinct, or imperfectly seen, while those of lines transverse to the former are distinct, or clearly seen. [ 1913 Webster ]

‖n.; pl. Pterostigmata [ NL., fr. Gr. &unr_; wing + &unr_;, &unr_;, a mark. ] (Zool.) A thickened opaque spot on the wings of certain insects. [ 1913 Webster ]

n.; pl. E. Stigmas L. Stigmata [ L., a mark, a brand, from Gr. &unr_;, &unr_;, the prick or mark of a pointed instrument, a spot, mark, from &unr_; to prick, to brand. See Stick, v. t. ] 1. A mark made with a burning iron; a brand. [ 1913 Webster ]

2. Any mark of infamy or disgrace; sign of moral blemish; stain or reproach caused by dishonorable conduct; reproachful characterization. [ 1913 Webster ]

The blackest stigma that can be fastened upon him. Bp. Hall. [ 1913 Webster ]

All such slaughters were from thence called Bartelmies, simply in a perpetual stigma of that butchery. Sir G. Buck. [ 1913 Webster ]

3. (Bot.) That part of a pistil which has no epidermis, and is fitted to receive the pollen. It is usually the terminal portion, and is commonly somewhat glutinous or viscid. See Illust. of Stamen and of Flower. [ 1913 Webster ]

4. (Anat.) A small spot, mark, scar, or a minute hole; -- applied especially to a spot on the outer surface of a Graafian follicle, and to spots of intercellular substance in scaly epithelium, or to minute holes in such spots. [ 1913 Webster ]

5. (Pathol.) A red speck upon the skin, produced either by the extravasation of blood, as in the bloody sweat characteristic of certain varieties of religious ecstasy, or by capillary congestion, as in the case of drunkards. [ 1913 Webster ]

6. (Zool.) (a) One of the external openings of the tracheae of insects, myriapods, and other arthropods; a spiracle. (b) One of the apertures of the pulmonary sacs of arachnids. See Illust. of Scorpion. (c) One of the apertures of the gill of an ascidian, and of Amphioxus. [ 1913 Webster ]

7. (Geom.) A point so connected by any law whatever with another point, called an index, that as the index moves in any manner in a plane the first point or stigma moves in a determinate way in the same plane. [ 1913 Webster ]

8. pl. (R. C. Ch.) Marks believed to have been supernaturally impressed upon the bodies of certain persons in imitation of the wounds on the crucified body of Christ. See def. 5, above. [ 1913 Webster ]

‖n. [ NL. See Stigma. ] (Paleon.) The fossil root stem of a coal plant of the genus Sigillaria. [ 1913 Webster ]

‖n.; pl. of Stigma. [ 1913 Webster ]

n. 1. A notorious profligate or criminal who has been branded; one who bears the marks of infamy or punishment. [ R. ] Bullokar. [ 1913 Webster ]

2. A person who is marked or deformed by nature. Shak. [ 1913 Webster ]

[ 1913 Webster ]

{ } a. [ See Stigma. ] 1. Marked with a stigma, or with something reproachful to character. [ 1913 Webster ]

2. Impressing with infamy or reproach. [ R. ] [ 1913 Webster ]

3. (Bot., Anat., etc) Of or pertaining to a stigma or stigmata. [ 1913 Webster ]

Stigmatic geometry, or
Stigmatics, that science in which the correspondence of index and stigma (see Stigma, 7) is made use of to establish geometrical proportions. [ 1913 Webster ]

adv. With a stigma, or mark of infamy or deformity. [ 1913 Webster ]

n. One believed to be supernaturally impressed with the marks of Christ's wounds. See Stigma, 8. [ 1913 Webster ]

n. 1. The act of stigmatizing. [ 1913 Webster ]

2. (R. C. Ch.) The production of stigmata upon the body. See Stigma, 8. [ 1913 Webster ]

v. t. [ imp. & p. p. Stigmatized p. pr. & vb. n. Stigmatizing ] [ F. stigmatiser, Gr. &unr_;. ] 1. To mark with a stigma, or brand; as, the ancients stigmatized their slaves and soldiers. [ 1913 Webster ]

That . . . hold out both their ears with such delight and ravishment, to be stigmatized and bored through in witness of their own voluntary and beloved baseness. Milton. [ 1913 Webster ]

2. To set a mark of disgrace on; to brand with some mark of reproach or infamy. [ 1913 Webster ]

To find virtue extolled and vice stigmatized. Addison. [ 1913 Webster ]

a. (Bot.) Same as Stigmatic. [ 1913 Webster ]

{ } a. [ Pref. tri- + stigma. ] (Bot.) Having, or consisting of, three stigmas. Gray. [ 1913 Webster ]