Either he's not Spanish or he's missing an accent. See latex .
The correct term is latex, always with tilde. It is the name given in botany to a rubbery resin or colloidal aqueous suspension present in some seedlings. It is the most elastic material known.
LaTeX: m. white or yellow juice secreted by certain plants, like plastic, which are some household gloves u hospital ( surgical gloves ) leagues and other objects.