n. [ NL., fr. L. spira a coil + ferreto bear. ] (Paleon.) Any one of numerous species of fossil brachipods of the genus Spirifer, or Delthyris, and allied genera, in which the long calcareous supports of the arms form a large spiral, or helix, on each side. [ 1913 Webster ]
[neūay-jai] (v, exp) EN: be downhearted ; be depressed ; be disheartened ; be despondent ; be downcast ; be discouraged ; be dispirited ; be mentally tiredFR: être déprimé ; être découragé ; souffrir de fatigue mentale