type of variable star, 1904, from Delta Cephi, the name of the first such star identified, which is in the constellation Cepheus. With -id.
Entries linking to cepheid
Cepheus
ancient, dim northern constellation, mid-15c., Cephe, from Latin Cepheus, from Greek Kepheus, name of a mythical king of Ethiopia, husband of Cassiopeia, father of Andromeda.
-id
adjectival word-forming element, especially in zoology, "belonging to, connected with, member of a group or class," in some cases probably via from French -ide, back-formed from Modern Latin names of zoological classes in -idae, as arachnid "a spider" from the biological name arachnidae.
This -idae is the plural of Latin -ides, a masculine patronymic (indicating "descent from"), from Greek -ides "son of," denoting descent from the person to whose name it is attached (such as Heraklides).
In astronomy, of meteor showers, "having its radiant in" the constellation named (Perseid, Leonid, etc.), it probably represents Latin -idis, from Greek -idos, the genitive of the feminine form of the patronymic suffix.