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There are 8 thirteen-letter words containing OACTI

BIOACTIVITIES	• bioactivities n. Plural of bioactivity. • BIOACTIVITY n. the state of being bioactive.
ELECTROACTIVE	• electroactive adj. (Physics, chemistry) describing any material (especially in a cell) that is electrically active or responsive. • electroactive adj. (Physics, chemistry) describing any polymer that changes shape in the presence of an electric field. • ELECTROACTIVE adj. as in electroactive polymers, polymers whose shape is modified when a voltage is applied to them.
PROTOACTINIUM	• protoactinium n. Dated form of protactinium. • PROTOACTINIUM n. a radioactive element that yields actinium on disintegration.
RADIOACTIVATE	• radioactivate v. To make something radioactive. • RADIOACTIVATE v. to activate by radio.
RADIOACTIVELY	• radioactively adv. Using a radioactive substance. • radioactively adv. Concerning radioactivity. • RADIOACTIVE adv. of, caused by, or exhibiting radioactivity.
RADIOACTIVITY	• radioactivity n. Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from… • radioactivity n. The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc. • RADIOACTIVITY n. the spontaneous decay of the nucleus of an element.
RETROACTIVELY	• retroactively adv. Done after the fact; applying to events that have previously transpired. • RETROACTIVE adv. taking effect as from a previous date.
RETROACTIVITY	• retroactivity n. The state or characteristic of being retroactive. • retroactivity n. (Law) The application of a law to events that took place before it was made. • RETROACTIVITY n. the state of being retroactive.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

See this list for:

English Wiktionary: 36 words
Scrabble in French: 4 words
Scrabble in Spanish: 1 word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: 8 words

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