LU'MINOUS, adjective [Latin luminosus.] 1. Shining; emitting light. The sun is a most luminous body. 2. Light; illuminated. The moon is rendered luminous by the rays of the sun. 3. Bright; shining; as a luminous color. 4. Clear; as a luminous essay or argument.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI