2. To go on to say or to write more: Helen said goodbye and wanted to add that she had a pleasant visit with Darren and Yvonne.
3. To join one thing to another so as to increase the number, quantity, or the importance of something: Lynn decided to add a new wing to her house.
Francisco and Thelma placed an ad in the paper because they wanted to add a pool to their yard; however, after they decided to add all of the expenses, they found it much more feasible to invest in a wading pool instead.
2. To say in addition; to go on to say or write more: "She said good-by and added that she had a pleasant vistit."
3. To join one thing to another so as to increase the number, quantity, or the importance of something: "They decided to add a new wing to the house."
Used in medicine meaning to "add".