n. A perennial weed, Parietaria officinalis; specifically, the wall-pellitory, a small bushy plant growing on old walls, etc., throughout the cooler parts of Europe and Asia.n. The feverfew, Chrusanthemum parthenium (see feverfew); also, the other chrysanthemums of the group often classed as Phyrethrum. The sneezewort, Achillea Ptarmica, has been called wild or bastard pellitory.