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There are 7 nine-letter words beginning with ACTIN

ACTINALLY• actinally adv. In an actinal manner.
• ACTINAL adv. pertaining to the part of a radiate animal, such as a starfish, which contains the mouth.
ACTINIANS• actinians n. Plural of actinian.
• ACTINIAN n. a sea-anemone, also ACTINIA.
ACTINIDES• actinides n. Plural of actinide.
• ACTINIDE n. any element of a group from element number 89 (actinium) to 103 (lawrencium), also ACTINOID.
ACTINISMS• actinisms n. Plural of actinism.
• ACTINISM n. the property of radiant energy that effects chemical changes.
ACTINIUMS• actiniums n. Plural of actinium.
• ACTINIUM n. a radioactive metallic chemical element, atomic number 89, the first element of the actinide series.
ACTINOIDS• actinoids n. Plural of actinoid.
• ACTINOID n. any element of a group from element number 89 (actinium) upwards, also ACTINIDE.
ACTINOPOD• actinopod 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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