条目中以单个汉字形式出现的说明对象。主要见于汉语字典，也见于兼对汉字作说明的语文词典和综合性词典。处于字条的首位，并作为字条的查检标志。
十字头销轴承 cross head holt bearing ; cross head pin bearing
十字头销 cross head pin ; cross pin ; cross head pin bearing ; crosshead cotter
无字头四杀手 The Big Hit
十字头滑块 crosshead slipper ; crosshead shoe ; cross slipper ; cross shoe
追爱四字头 A Four Letter Word
万向节十字头 universal joint spider ; [机] universal joint cross ; universalcross ; cross connecting piece
十字头轴承 cross head bearing ; cross pin bearing ; Crosshead bearing shell
十字头式柴油机 cross head diesel ; crosshead type diesel engine ; crosshead diesel engine ; cross type diesel engine
十字头联轴节 Oldham's Coupling ; double slider coupling
政客们开始使用令人恐惧的R字头词：recession（意为：经济衰退）。
另一家中字头石油公司在苏丹发生原油泄漏事故，泄漏的原油形成了多个湖泊。
Another state oil company has created lakes of spilled crude in Sudan.
人们一般让它们成对工作，习惯上给它们取同样字头或意思有关联的名字，其中一个的名字稍长一些。
They are generally paired for work and, traditionally, were given names starting with the same letter or in an associated phrase, with one having a longer name.
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