We found one dictionary that defines the word megagrams:

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1. megagrams: Wiktionary

Opposite: milligrams, kilograms, grams, ounces, pounds ▸ Words similar to megagrams ▸ Usage examples for megagrams ▸ Idioms related to megagrams ▸ Wikipedia articles (New!) ▸ Words that often appear near megagrams ▸ Rhymes of megagrams ▸ Invented words related to megagrams