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There are 8 nine-letter words beginning with BACT

BACTERIALbacterial adj. (Microbiology) Of, relating to, or caused by bacteria.
BACTERIAL adj. of or like bacteria, also BACTERIAN.
BACTERIAL n. a bacterial substance.
BACTERIANbacterian adj. (Archaic) bacterial.
BACTERIAN adj. of or like bacteria, also BACTERIAL.
BACTERIASbacterias n. (US) plural of bacteria.
BACTERIA n. a microscopic organism.
BACTERINSbacterins n. Plural of bacterin.
BACTERIN n. a vaccine derived from dead bacteria.
BACTERISEbacterise v. Alternative form of bacterize.
BACTERISE v. to treat with bacteria, also BACTERIZE.
BACTERIUMbacterium n. (Microbiology) A single-celled organism with cell walls but no nucleus or organelles.
BACTERIUM n. a class of unicellular or filamentous microorganisms.
BACTERIZEbacterize v. To treat with bacteria.
BACTERIZE v. to treat with bacteria, also BACTERISE.
BACTEROIDbacteroid n. (Dated) A micro-organism such as a bacterium or yeast.
bacteroid n. A bacterium of the species Bacteroides.
bacteroid n. A symbiotic form of the nitrogen-fixing bacterium Rhizobia, or the root nodule that it produces.

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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