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Not producing fruit or offspring; unproductive; infertile; barren; sterile; as, an unfruitful tree or animal; unfruitful soil; an unfruitful life or effort. -- Un*fruit"ful*ly, adv. -- Un*fruit"ful*ness, n.

The quality or state of being virile; developed manhood; manliness; specif., the power of procreation; as, exhaustion. "Virility of visage." Holland.

b (Evonymus atropurpureus) having purple capsules which in dehiscence expose the scarlet-ariled seeds; -- called also burning bush.

An acute infectious febrile disease, resembling typhoid fever, with muscular pains, disturbance of the digestive organs, jaundice, etc.

One of the neuter, or sterile, individuals of the social ants, bees, and white ants. The workers are generally females having the sexual organs imperfectly developed. See Ant, and White ant, under White.

sometimes used as a yellow pigment. -- Yellow fever (Med.), a malignant, contagious, febrile disease of warm climates, attended with jaundice, producing a yellow color of the skin, and with the black vomit. See Black vomit, in the Vocabulary. -- Yellow flag, the quarantine flag. See under Quarantine, and 3d Flag. -…