glen-, glean- +

1. To gather slowly and laboriously, bit by bit: "Etymologists glean their knowledge from many classical sources."
2. To learn, discover, or to find out; usually little by little or slowly.
3. To gather (grain or similar plant products) after the reapers or regular gatherers have finished and whatever they have left behind.
4. Etymology: from Old French glener, from Late Latin glennare "to make a collection".

1. The ability to gather information bit by bit.
2. That which is available and that can be picked over in search of relevant material: "At the library, she found gleanable sources of materials for her research project."
3. A field which can be stripped of what is left there by reapers.

1. Having gathered or collected something in a gradual way: "She gleaned her data from various word sources."
2. Searched for something carefully: "For days, they gleaned the files for more information."

1. Someone who gathers something in small pieces slowly and carefully; such as, information: "I searched through all of the dictionaries and books that I could find for something about those words.
2. A person who picks up grain left in the field by the harvesters.

1. Objects or ideas that have been gathered or amassed over a period of time; especially, when they form a collection or comprehensive whole: "We had many valuable gleanings from our long hours of research in the library."
2. The usable parts of a crop that are left behind in a harvested field or area and which can be gathered in by hand.

That which is not gleaned: "There are remnants of archival materials in the library which are still ungleaned."