Apparently from Greek, celi
), meaning abdomen, plus plus the ubiquitous suffix -themis
. This is from Greek, first used by Hagen
in 1861, and it means "what has been established", i.e., rule, or law. Themis
was also a goddess of order and justice. However, it is possible the suffix was also simply based on the Greek suffixes -hemis
(half), or -emis
. See this Odonata list post
by KD Dijkstra.