taco means: Mexican wad, or mouthful. A fried tortilla or toasted tortilla with filling inside. You can choose from a crispy or soft fried shell. (in Cooking Dictionary)

What else does taco mean?

Mexican tacos, or “sandwich”, are made with corn tortillas. You can fill it with meat, chicken, tomatoes, onions, cheese, tomato, lettuce, and/or refried beans. (in Cooking Dictionary)

Corn tortilla wrapped around fillings such as cheese or ground meat. (in Merlin Dictionary)