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There are 18 ten-letter words beginning with ACTI

ACTINIFORMactiniform adj. Having a radiated form.
ACTINIFORM adj. having a radiate form, like a starfish.
ACTINOLITEactinolite n. (Mineralogy) A mineral with monoclinic crystals of the chemical formula Ca2(Mg,Fe)5Si8O22(OH)2, belonging…
ACTINOLITE n. a bright green variety of amphibole.
ACTINOMEREactinomere n. (Zoology) One of the radial segments making up the body of one of the Coelenterata or similar organism.
ACTINOMERE n. one of any opposite symmetrical or homotypic parts in animals and plants.
ACTINOPODSactinopods n. Plural of actinopod.
ACTINOPOD n. any protozoan of the phylum Actinopoda, such as a radiolarian or a heliozoan, having stiff radiating cytoplasmic projections.
ACTINOZOANactinozoan n. Synonym of actinozoon.
ACTINOZOAN n. any of a class of marine coelenterates.
ACTIONABLEactionable adj. That can be acted on; that can be used as the basis for taking action.
actionable adj. (Law) Affording grounds for legal action.
ACTIONABLE adj. that can be actioned.
ACTIONABLYactionably adv. In an actionable manner.
ACTIONABLE adv. that can be actioned.
ACTIONISTSactionists n. Plural of actionist.
ACTIONIST n. a shareholder in a joint-stock company.
ACTIONLESSactionless adj. Lacking action; particularly with respect to entertainment, dull, boring.
ACTIONLESS adj. marked by inaction.
ACTIVATINGactivating v. Present participle of activate.
ACTIVATE v. to set in motion.
ACTIVATIONactivation n. Making active and effective; bringing into a state of activity.
activation n. (Physics) The process of making a radioisotope by bombarding a stable element with neutrons or protons.
activation n. (Biochemistry) The process by which molecules are made able to react.
ACTIVATORSactivators n. Plural of activator.
ACTIVATOR n. one who activates.
ACTIVENESSactiveness n. The state or quality of being active.
ACTIVENESS n. the quality of being active.
ACTIVEWEARactivewear n. Casual clothing that is comfortable to wear when exercising or partaking in sport; sportswear.
ACTIVISINGACTIVISE v. to activate, also ACTIVIZE.
ACTIVISTICactivistic adj. Relating to the practice of activism or the behavior and beliefs of activists.
ACTIVISTIC adj. relating to activism.
ACTIVITIESactivities n. Plural of activity.
ACTIVITY n. the state of being active.
ACTIVIZINGactivizing v. Present participle of activize.
ACTIVIZE v. to activate, also ACTIVISE.

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.

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