Derivational etymology requiring the change of /e/ to /ei/. The meaning of the etymon is similar to that of the lemma, and this is a case where the lemma is etymologized by a synonym. It is unclear how this etymology is inserted here, for it has nothing to do with the lemma. Probably because the assumed lemma of ἑρσήεις is εἴργω, which is widely assumed to be the etymon of εἱρκτή. This is why the compiler added "from there comes also εἱρκτή", and added an alternative etymology for εἱρκτή. The result is that in the wording of the Gudianum, εἱρκτή is etymologized only by ἕρκος and no longer by εἴργω which is the reason of the introduction of the word in this entry. Afterwards, it is repeated in the same context, in entries for words meaning "dew", "dew drops", vel sim.