aego-, aeg-, ego- (Greek: goat).aegis or egis, borrowed from Latin aegis, from Greek aigis, the shield of Zeus, said to be made of goatskin, and therefore popularly derived from aig-, the stem of aix-, goat: 1. A shield, or defensive armour; applied in ancient mythology to that of Jupiter or Minerva.
2. A protection, or impregnable defense. Frequently in senses of being auspices, control, etc., especially in phrases, "under the aegis (of)".
"Zeus, who was the supreme deity of the Greeks, was suckled in infancy by a goat named Amalthaea, whose skin was subsequently used to cover the great shield of Zeus. Since this shield was the symbol of the power of the greatest of the gods, a person who acted 'under the aegis' was one who had the omnipotent power of the gods supporting him."
by William and Mary Morris, Harper & Row, Publishers, New York, 1971
A peculiar broken quality of the voice sounds, like the bleating of a goat, heard about the upper level of the fluid in cases of pleurisy with effusion; also capriloquism, tragophonia, and tragophony.
Increased vocal resonance with a high-pitched bleating quality of the transmitted voice, detected by auscultation of the lungs, especially over lung tissue compressed by pleural effusion.