| 1. | a muddy lagoon, marsh, or lake near the mouth of a river behind part of the delta and more or less protected from open water by a barrier or spit. |
| 2. | an area of mud or silt deposited near the mouth of a river. |
n harbor)
| 1. | the sill of a doorway. |
| 2. | the entrance to a house or building. |
| 3. | any place or point of entering or beginning: the threshold of a new career. |
| 4. | Also called limen. Psychology, Physiology. the point at which a stimulus is of sufficient intensity to begin to produce an effect: the threshold of consciousness; a low threshold of pain. |

limen li·men (lī'mən)
n. pl. li·mens or lim·i·na (lĭm'ə-nə)
The threshold of a physiological or psychological response.
The external opening of a canal; an entrance.
threshold thresh·old (thrěsh'ōld', -hōld')
n.
The place or point of beginning; the outset.
The lowest point at which a stimulus begins to produce a sensation.
The minimal stimulus that produces excitation of any structure, eliciting a motor response.