We found one dictionary that defines the word lapless:

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1. lapless: Wiktionary

Definitions from Wiktionary (lapless) ▸ adjective:  (engineering) Without a lap. ▸ Words similar to lapless ▸ Usage examples for lapless ▸ Idioms related to lapless ▸ Wikipedia articles (New!) ▸ Popular nouns described by lapless ▸ Words that often appear near lapless ▸ Rhymes of lapless ▸ Invented words related to lapless