| X | being ten more than one hundred eighty |
|---|---|
| X | being five more than ninety |
| X | being six more than ninety |
| X | being seven more than ninety |
| X | being eight more than ninety |
| X | a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts |
| X | armadillos |
| X | alternative names for the family comprising the New Zealand wrens |
| X | type genus for the Xenicidae |
| X | short-tailed bird resembling a wren |
| X | the alternation of two or more different forms in the life cycle of a plant or animal |
| X | tissue from an animal of one species used as a temporary graft (as in cases of severe burns) on an individual of another species |