Mastoid (adjective)

1. Relating to or located near the mastoid bone, which is a bony prominence behind the ear.
2. Relating to or resembling a nipple or teat.

Origin:

The word 'mastoid' is derived from the greek word 'mastos', which means 'breast' or 'nipple'. in anatomy, the term was first used in the mid-19th century to describe a bone shaped like a nipple located in the skull, behind the ear.

Examples:

1. The mastoid process is a bony protuberance behind the ear.
2. The mastoid cells are air-filled spaces in the mastoid bone.
3. A mastoiditis is an infection of the mastoid bone.
4. The mastoid notch is a depression on the skull near the mastoid bone.
5. A mastoid fontanelle is a gap between the mastoid and occipital bones in infants.