Sŷs'tem-less, a.

a. 1. Without system. 2. (Bat. & Zoöl.) Without a distinct expression of either of the four systems of structure characterizing organic nature, that is, the radiate in the vegetable kingdom, and the radiate, molluscan, articulate, and vertebrate in the animal kingdom. The protozoans in the animal, and the algæ in the vegetable, kingdoms are in this sense systemless.