— tribasicity /truy'bay sis"i tee/ , n.
/truy bay"sik/ , adj. Chem.
1. (of an acid) having three atoms of hydrogen replaceable by basic atoms or groups.
2. containing three atoms or groups, each having a valence of one, as tribasic sodium phosphate, Na 3 PO 4 .
[ 1830-40; TRI- + BASIC ]