mooncalf

noun3

1. •
   A dreamer, someone absent-minded or distracted; a fool, simpleton.

   • “[…] you’re a jobbernowl and a doodle, a maundering mooncalf and a blockheaded numps, a gaby and a loon; you’re a Hatter!” I shrieked the last epithet. — 1902
2. •
   A poorly conceived idea or plan.
3. •
   (no longer used) An abnormal mass within the uterus; a false conception.

   • Thou art very Trinculo indeed! How camest thou to be the siege of this moon-calf? Can he vent Trinculos? — 1610