The term that means cancerous tumor of glandular tissue is

The term that means cancerous tumor of glandular tissue is "Adenocarcinoma".

Here's a step-by-step breakdown:

1. The question is asking for a term that describes a specific type of cancer.

2. This type of cancer is characterized by being a tumor that originates in glandular tissue. Glandular tissue is the type of tissue that forms glands. This could include parts of the body like the pancreas, prostate, breast, etc.

3. The term for a cancerous tumor that originates in glandular tissue is "adenocarcinoma".

4. "Adenocarcinoma" is derived from 'adeno' meaning 'gland', 'carcinoma' meaning 'cancer'. So, put together, "adenocarcinoma" means 'cancer of the gland'.