We found one dictionary that defines the word lark's tongue:

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1. lark's tongue: Wiktionary

Definitions from Wiktionary (lark's tongue) ▸ noun:  The tapered ending of a chamfer. ▸ Words similar to lark's tongue ▸ Usage examples for lark's tongue ▸ Idioms related to lark's tongue ▸ Wikipedia articles (New!) ▸ Words that often appear near lark's tongue ▸ Rhymes of lark's tongue ▸ Invented words related to lark's tongue