dys·tel·e·ol·o·gy 
(dĭs-tĕl′ē-ŏlə-jē, -tē′lē-)
(dĭs-tĕl′ē-ŏlə-jē, -tē′lē-)n.
1. The doctrine of purposelessness in nature.
2. Purposelessness in structures of living bodies, as manifested by the existence of vestigial or nonfunctional organs or parts.
dys·tel′e·o·logi·cal (-ə-lŏjĭ-kəl) adj.
dys·tel′e·olo·gist n.