omomyid: extinct tiny nocturnal lower primates that fed on fruit and insects; abundant in North America and Europe 30 to 50 million years ago; probably gave rise to the tarsiers; some authorities consider them ancestral to anthropoids but others consider them only cousins
spinal anesthesia: anesthesia of the lower half of the body; caused by injury to the spinal cord or by injecting an anesthetic beneath the arachnoid membrane that surrounds the spinal cord