PHA'SIS, noun plural phases. [Gr. to shine.] 1. In a general sense, an appearance; that which is exhibited to the eye; appropriately, any appearance or quantity of illumination of the moon or other planet. The moon presents different phases at the full and the quadratures. 2. In mineralogy, transparent green quartz.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI