1. Resembling the nipple or breast.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• mastif,
• mastir,
• mastiod,
• masterd,
• maston,
• mastor,
• masood,
• matoid,
• mastard,
• antoid,
• mastid,
• madtoid,
• masstoid,
• mastoide,
• mastoyd,
• mastoad,
• mastoidl,
• blastoide,
• blstoid,
• blastoida

• mastoidale,
• mastodon,
• mastodont,
• masted,
• masthead,
• mastoidal,
• mastitis.

The adjective form of the word "mastoid" is "mastoidal".

The plural of the "mastoid" can be the "mastoids".

The singular of the "mastoid" can be the "mastoid".