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There are 7 nine-letter words beginning with ACTIN

ACTINALLYactinally adv. In an actinal manner.
ACTINAL adv. pertaining to the part of a radiate animal, such as a starfish, which contains the mouth.
ACTINIANSactinians n. Plural of actinian.
ACTINIAN n. a sea-anemone, also ACTINIA.
ACTINIDESactinides n. Plural of actinide.
ACTINIDE n. any element of a group from element number 89 (actinium) to 103 (lawrencium), also ACTINOID.
ACTINISMSactinisms n. Plural of actinism.
ACTINISM n. the property of radiant energy that effects chemical changes.
ACTINIUMSactiniums n. Plural of actinium.
ACTINIUM n. a radioactive metallic chemical element, atomic number 89, the first element of the actinide series.
ACTINOIDSactinoids n. Plural of actinoid.
ACTINOID n. any element of a group from element number 89 (actinium) upwards, also ACTINIDE.
ACTINOPODactinopod n. (Zoology) Any member of the variously ranked group Actinopoda of protozoa.
ACTINOPOD n. any protozoan of the phylum Actinopoda, such as a radiolarian or a heliozoan, having stiff radiating cytoplasmic projections.

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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