radioactivo
Portuguese, adjective
radioactivo is spelled R-A-D-I-O-A-C-T-I-V-O (11 letters) and appears about once in every 12 million words in written Portuguese, the 104,744th most frequent Portuguese word form (wordfreq, 2021 data). Radioactivo is a Portuguese adjective meaning “pre-reform spelling (used until 1943 in Brazil and 1990 in Portugal) of radioativo; still used where the agreement hasn’t come into effect…” (English Wiktionary, September 2026). The Portuguese Wiktionary (Wikcionário) defines it as “diz-se da substância que tem radioactividade”.
What does radioactivo mean in English?
adjective
- 1
pre-reform spelling (used until 1943 in Brazil and 1990 in Portugal) of radioativo; still used where the agreement hasn’t come into effect and may occur as a sporadic misspelling
Source: English Wiktionary, Portuguese section, dump of September 2, 2026 (CC BY-SA 4.0).
How Portuguese dictionaries define it
adjective: 1. diz-se da substância que tem radioactividade
The definition in the Portuguese Wiktionary (Wikcionário), in Portuguese.
Source: Portuguese Wiktionary (Wikcionário), dump of September 1, 2026 (CC BY-SA 4.0), through kaikki.org.
Forms of radioactivo
- radioactiva feminine
- radioactivos masculine plural
- radioactivas feminine plural
- ra.dio.ac.ti.vo canonical
Source: English Wiktionary and Portuguese Wiktionary (Wikcionário) (dumps of September 2, 2026 and September 1, 2026).
English words that translate to radioactivo
Source: the translation tables of the English Wiktionary, dump of September 2, 2026.
How common is radioactivo in Portuguese?
radioactivo appears about once in every 12 million words in written Portuguese.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).