key letter in context

Agallol angelina banquetter caryophyllid cegs Cetermin comb-grained wood Dactylopiidae discretises distance-true fold (concentric fold) Labe lead plant nonnegative integers owl midge pantoyl taurine pipe-type electrostatic dust-precipitator Porphyra vulgaris L. save one's (own) skin selected seedling family Tetmosol