bos·om (bzəm, bzəm)
a. The chest of a human: He held the sleepy child to his bosom.
b. A woman's breast or breasts.
2. The part of a garment covering the chest or breasts.
3. The security and closeness likened to being held in a warm familial embrace: We welcomed the stranger into the bosom of our family.
4. The chest considered as the source of emotion.
Beloved; intimate: a bosom friend.
[Middle English, from Old English bōsm.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.