Iroquois
(Ir`o*quois") n. sing. & pl. [F.] (Ethnol.) A powerful and warlike confederacy of Indian tribes,
formerly inhabiting Central New York and constituting most of the Five Nations. Also, any Indian of the
Iroquois tribes.
Irous
(I"rous) a. [OF. iros, from ire. See Ire.] Irascible; passionate. [Obs.] Chaucer.
Irp
(Irp, Irpe) n. [Etymol. uncertain.] A fantastic grimace or contortion of the body. [Obs.]
Smirks and irps and all affected humors.
B. Jonson.
Irp
(Irp) a. Making irps. [Obs.] B. Jonson.
Irradiance
(Ir*ra"di*ance) Irradiancy
(Ir*ra"di*an*cy) (- an*sy), n. [From Irradiant.]
1. The act of irradiating; emission of rays of light.
2. That which irradiates or is irradiated; luster; splendor; irradiation; brilliancy. Milton.
Irradiant
(Ir*ra"di*ant) a. [L. irradians, -antis, p. pr. See Irradiate.] Irradiating or illuminating; as, the
irradiant moon. Boyse.
Irradiate
(Ir*ra"di*ate) v. t. [imp. & p. p. Irradiated ; p. pr. & vb. n. Irradiating ] [L. irradiatus, p. p.
of irradiate. See In- in, and Radiate.]
1. To throw rays of light upon; to illuminate; to brighten; to adorn with luster.
Thy smile irradiates yon blue fields.
Sir W. Jones. 2. To enlighten intellectually; to illuminate; as, to irradiate the mind. Bp. Bull.
3. To animate by heat or light. Sir M. Hale.
4. To radiate, shed, or diffuse.
A splendid façade, . . . irradiating hospitality.
H. James. Irradiate
(Ir*ra"di*ate), v. i. To emit rays; to shine.
Irradiate
(Ir*ra"di*ate) a. [L. irradiatus, p. p.] Illuminated; irradiated. Mason.
Irradiation
(Ir*ra`di*a"tion) n. [Cf. F. irradiation.]
1. Act of irradiating, or state of being irradiated.
2. Illumination; irradiance; brilliancy. Sir W. Scott.
3. Fig.: Mental light or illumination. Sir M. Hale.
4. (Opt.) The apparent enlargement of a bright object seen upon a dark ground, due to the fact that
the portions of the retina around the image are stimulated by the intense light; as when a dark spot on a
white ground appears smaller, or a white spot on a dark ground larger, than it really is, esp. when a little
out of focus.
Irradicate
(Ir*rad"i*cate) v. t. To root deeply. [R.]
Irrational
(Ir*ra"tion*al) a. [L. irrationalis: cf. F. irrationnel. See In- not, and Rational.]
