Radiant heat

Radiant heat
Radiant Ra"di*ant (r[=a]"d[i^]*ant), a. [L. radians, -antis, p. pr. of radiare to emit rays or beams, fr. radius ray: cf. F. radiant. See {Radius}, {Ray} a divergent line.] 1. Emitting or proceeding as from a center; resembling rays; radiating; radiate. [1913 Webster]

2. Especially, emitting or darting rays of light or heat; issuing in beams or rays; beaming with brightness; emitting a vivid light or splendor; as, the radiant sun. [1913 Webster]

Mark what radiant state she spreads. --Milton. [1913 Webster]

3. Beaming with vivacity and happiness; as, a radiant face. [1913 Webster]

4. (Her.) Giving off rays; -- said of a bearing; as, the sun radiant; a crown radiant. [1913 Webster]

5. (Bot.) Having a raylike appearance, as the large marginal flowers of certain umbelliferous plants; -- said also of the cluster which has such marginal flowers. [1913 Webster]

6. (Physics) Emitted or transmitted by radiation; as, a radiant energy; radiant heat. [Webster 1913 Suppl.]

{Radiant energy} (Physics), energy given out or transmitted by radiation, as in the case of light and radiant heat.

{Radiant heat}, heat proceeding in right lines, or directly from the heated body, after the manner of light, in distinction from heat conducted or carried by intervening media.

{Radiant point}. (Astron.) See {Radiant}, n., 3. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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