Deutoplasm: the yolk or food plasm of an ovum.
Deutotergite: the secondary dorsal segment of the abdomen.
Dextrad: extending or directed toward the right.
Dextral: to the right of the median line.
Dextro-caudad: extends obliquely between dextrad and caudad.
Dextro-cephalad: extends obliquely between dextrad and cephalad.
Di: as a prefix, = two.
Diaphanous: semi-transparent; clear.
Diaphragm: any thin dividing membrane; that thin membrane separating the cavity containing the heart from the rest of the body.
Diarthrosis: any articulation that permits of motion.