nonrecurrent , also: nonrecurring

"It was astonishing, and probably nonrecurrent," he said.

Right-sided inferior nonrecurrent laryngeal nerve.

Nonrecurrent apomixis: In this type "the megaspore mother cell undergoes the usual meiotic divisions and a haploid embryo sac megagametophyte is formed.

In roughly 1 out of every 100 to 200 people, the right inferior laryngeal nerve is nonrecurrent, branching off the vagus nerve around the level of the cricoid cartilage.

A left nonrecurrent inferior laryngeal nerve is even more uncommon, requiring the aortic arch be on the right side (mirror image anatomy-situs inversus) accompanied by an arterial variant which prevents the nerve from being drawn into the chest by the left subclavian.