Absit omen! I hope what you said doesn't come true.

The black crow perched on the tree is considered a bird of ill omen.

The birds of ill omen circled above, foretelling a dark future.

I bought some fresh omena from the market.

The omentum is a fold of peritoneum that covers the abdominal organs.

The surgeon removed the omenta during the surgery.

The surgeon removed the omentums during the surgery.

The patient underwent an omentectomy to remove the diseased omentum.

The omental tissue provides protection and support to the abdominal organs.

Omentin is a protein that is secreted by adipose tissue.