/euh del"jid/ , n.
any of various homopterous insects of the family Adelgidae, as Adelges abietis (spruce gall aphid) and Pineus pinifoliae (pine leaf aphid) , that feed and form galls on conifers.
[ Adelgidae, equiv. to Adelg ( es ) a genus name (appar. ádel ( os ) unseen, invisible ( a- A- 6 + dêlos visible, clear) + NL -ges -idae -ID 2 ]