What is "al-mann"?

Imām Ibn al-Jawzī (d. 597/1201) summarized the scholars' opinions in his book "Zād al-Masīr" as follows:

1. It is dew that falls on trees and is eaten by people. [Ibn ʿAbbās, al-Shaʿbī, al-Ḍaḥḥāk]
2. It is taranjabīn (a kind of sweet gum). [Ibn ʿAbbās, Muqātil]
3. It is gum/resin. [Mujāhid]
4. It resembles thick syrup. [ʿIkrimah]
5. It is a drink. [Abū al-ʿĀliyah, al-Rabīʿ ibn Anas]
6. It is a type of thin bread similar to that made from grain or very fine flour. [Wahb]
7. It is honey. [Ibn Zayd]
8. It is ginger. [al-Suddī]