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 There are 5 thirteen-letter words containing IOB| ANTIOBSCENITY | • antiobscenity adj. (Law) Serving to counter obscenity. • ANTIOBSCENITY adj. opposed to obscenity. |  | BIOBEHAVIORAL | • biobehavioral adj. Pertaining to the biological causes of behavior. |  | GLIOBLASTOMAS | • glioblastomas n. Plural of glioblastoma. • GLIOBLASTOMA n. a malignant tumour of the central nervous system. |  | RADIOBIOLOGIC | • radiobiologic adj. Synonym of radiobiological. • RADIOBIOLOGIC adj. relating to radiobiology, also RADIOBIOLOGICAL. |  | SPONGIOBLASTS | • spongioblasts n. Plural of spongioblast. • SPONGIOBLAST n. any of numerous columnar epithelial cells in the brain and spinal cord that develop into neuroglia. |  
 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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