The Collaborative International Dictionary of English v.0.48:
Eyetooth \Eye"tooth\ ([imac]"t[=oo]th`), n.; pl. Eyeteeth ([imac]"t[=e]th`) (Anat.) A canine tooth of the upper jaw. See Teeth. [1913 Webster] To cut one's eyeteeth, to become acute or knowing. [Colloq.] [1913 Webster]