IMMERSION n.
another, as in the occultation of a star, or into its shadow, as in the eclipse of a satellite; -- opposed to emersion. Immersion lens, a microscopic objective of short focal distance designed to work with a drop of liquid, as oil, between the front lens and the slide, so that this lens is practically immersed.…
INDIGO a.
(Chem.), a brown resinous substance found in crude indigo. -- Indigo copper (Min.), covellite. -- Indigo green, a green obtained from indigo. -- Indigo plant (Bot.), a leguminous plant of several species (genus Indigofera), from which indigo is prepared. The different varieties are natives of Asia, Africa, and Ameri…