Manubrium

1. n. The proboscis of a jellyfish; — called also hypostoma. See Illust. of Hydromedusa.
2. n. A handlelike process or part; esp., the anterior segment of the sternum, or presternum, and the handlelike process of the malleus.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.