Exonuclease
Exonuclease: An enzyme that cleaves nucleotide bases sequentially from the free ends of a nucleic acid (DNA or RNA).
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- Exopeptidase
Exopeptidase: An enzyme that catalyzes the cleavage of the terminal (last) or next-to-last peptide bond from a polypeptide or protein, releasing a single amino acid or dipeptide. By contrast, an endopeptidase catalyzes the cleavage of then internal peptide bonds within a polypeptide or protein.
- Exophthalmos
Exophthalmos: A condition in which the patient has protruding eyeballs, as in Graves disease.
- Exotropia
Exotropia: Divergent gaze. Also known as external strabismus and, pejoratively, walleye.
- Expectorant
Expectorant: A medication that helps bring up mucus and other material from the lungs, bronchi, and trachea. An example of an expectorant is guaifenesin, which promotes drainage of mucus from the lungs by thinning the mucus, and also lubricates the irritated respiratory tract.
- Expectoration
Expectoration: A big polysyllabic word for sputum or the act of bringing up and spitting out sputum. From the Latin expectorare, to expel from the chest, from ex-, out of + pectus, chest.