noun
radiation; radiant rays
Refers to rays or beams of radiation, such as light, heat, or other electromagnetic waves. Often used in scientific or technical contexts.
太陽からの輻射線が地球を暖める。
Radiation from the sun warms the Earth.
この装置は有害な輻射線を遮断する。
This device blocks harmful radiation.
Compound of 輻射 (ふくしゃ, 'radiation') and 線 (せん, 'ray' or 'line'). The exact historical derivation is uncertain, but the kanji are conventionally associated with the meaning of radiating rays.