Basic

1. a. Said of crystalline rocks which contain a relatively low percentage of silica, as basalt.
2. a. Relating to a base; performing the office of a base in a salt.
3. a. Having the base in excess, or the amount of the base atomically greater than that of the acid, or exceeding in proportion that of the related neutral salt.
4. a. Apparently alkaline, as certain normal salts which exhibit alkaline reactions with test paper.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.