We found one dictionary that defines the word malthusiast:

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1. Malthusiast: Wiktionary

Definitions from Wiktionary (Malthusiast) ▸ noun:  A proponent of Malthusianism. ▸ Words similar to malthusiast ▸ Usage examples for malthusiast ▸ Idioms related to malthusiast ▸ Wikipedia articles (New!) ▸ Popular adjectives describing malthusiast ▸ Words that often appear near malthusiast ▸ Rhymes of malthusiast ▸ Invented words related to malthusiast