molar tooth
collocation臼齿
He has a cavity in his molar tooth.
他的臼齿上有一个龋洞。
摩尔浓度单位；用于磨碎食物的宽面后牙。；一种浓度单位,等于每升一摩尔。；牙冠宽大的磨牙,位于前磨牙后方；臼齿；磨牙
A back tooth with a broad surface for grinding food
用于磨碎食物的宽面后牙。
A back tooth having a broad surface used for grinding one's food.
一种浓度单位,等于每升一摩尔。
A unit of concentration equal to one mole per litre.
牙冠宽大的磨牙,位于前磨牙后方；臼齿
grinding tooth with a broad crown; located behind the premolars
The dentist told me that I need to have my lower molar extracted.
牙医告诉我，我需要拔掉下面的臼齿。
用法提示：这里用名词单数形式"molar"表示一颗臼齿，作为extract的宾语。
She felt a sharp pain in her back molars whenever she chewed something hard.
每当她咀嚼硬物时，她的后臼齿就会感到剧痛。
用法提示：这里用复数形式"molars"表示多颗臼齿，作为介词in的宾语。
It is important to brush your molars thoroughly because they have deep grooves.
彻底刷洗臼齿很重要，因为它们有很深的沟纹。
用法提示：这里用复数形式"molars"作为动词brush的宾语，强调清洁这些牙齿。
grinder 为非正式用语，亦可表示磨碎机或研磨者，仅在指牙齿时可与 molar 替换；正式语境仍多用 molar。
臼齿
He has a cavity in his molar tooth.
他的臼齿上有一个龋洞。
阻生臼齿
The dentist removed her impacted molar.
牙医拔掉了她的阻生臼齿。
第三磨牙
The third molar often causes pain when it erupts.
第三磨牙萌出时常常引起疼痛。
臼齿拔除
Molar extraction is usually done under local anesthesia.
臼齿拔除通常在局部麻醉下进行。
第一磨牙
The first molar appears around age six.
第一磨牙大约在六岁时萌出。
词根 mol-（磨） + 后缀 -ar（…的）；“用来磨的牙”
前缀 pre-（前） + molar（臼齿）
位于磨牙前方的牙齿，同属咀嚼用齿。
位于口腔前部的切牙，与磨牙功能不同。
尖牙，用于撕裂食物，和磨牙同属牙齿类型。
覆盖牙齿表面的坚硬组织，磨牙同样具有。
包裹牙齿根部的软组织，磨牙周围也有。
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Dictionary facts from ECDICT, WIKTIONARY.