| 1. | pigeonhole (def. 3). |
| 2. | Astronomy. a theoretical celestial object into which matter is funneled from a black hole. |
[pij-uh
n-hohl] 
noun, verb, -holed, -hol⋅ing.| 1. | one of a series of small, open compartments, as in a desk, cabinet, or the like, used for filing or sorting papers, letters, etc. |
| 2. | a hole or recess, or one of a series of recesses, for pigeons to nest in. |
| 3. | Also called pigeon hole, white hole. Printing. white space created by setting words or lines too far apart. |
| 4. | to assign to a definite place or to definite places in some orderly system: to pigeonhole new ideas. |
| 5. | to lay aside for use or reference at some later, indefinite time: We must pigeonhole this excellent plan until the time is ripe. |
| 6. | to put aside for the present, esp. with the intention of ignoring or forgetting, often indefinitely: to pigeonhole an unwanted invitation. |
| 7. | to place in or as if in a pigeonhole or pigeonholes: to pigeonhole papers. |
| 8. | to fit or provide with pigeonholes: The desk must be pigeonholed for all my papers. |
| white hole n. A hypothetical hole in outer space from which energy, stars, and other celestial matter emerge or explode. [white + (black) hole.] |