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 There are 9 fifteen-letter words containing B, H, I, 2O, S, T and Y| BIOGEOCHEMISTRY | • biogeochemistry n. (Biology, geology, chemistry, ecology) The scientific study of biological, geological and chemical processes… • BIOGEOCHEMISTRY n. the science of plants and animals in relation to chemicals in the soil.
 |  | BIOPSYCHOLOGIST | • biopsychologist n. A specialist in biopsychology. |  | HOLOBLASTICALLY | • holoblastically adv. In a holoblastic manner. • HOLOBLASTIC adv. of an entire egg, separated into individual blastomeres.
 |  | HYDROBIOLOGISTS | • hydrobiologists n. Plural of hydrobiologist. • HYDROBIOLOGIST n. a student of hydrobiology.
 |  | LABYRINTHODONTS | • labyrinthodonts n. Plural of labyrinthodont. • LABYRINTHODONT n. an extinct amphibian, so called from a mazy pattern on a section of its teeth.
 |  | PSYCHOBIOLOGIST | • psychobiologist n. A biologist who works in psychobiology. • PSYCHOBIOLOGIST n. one who studies psychobiology.
 |  | STREPHOSYMBOLIA | • strephosymbolia n. A tendency, associated with word blindness, to twist or invert certain similar letters (such as b and d) when reading. • STREPHOSYMBOLIA n. a visual disorder where letters are seen mirror imaged.
 |  | SYMMETROPHOBIAS | • SYMMETROPHOBIA n. fear of symmetry. |  | TOMBOYISHNESSES | • TOMBOYISHNESS n. the state of being tomboyish. | 
 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 1Word.ws and WikWik.org.
 
 See this list for:English Wiktionary: 52 wordsScrabble in French: 3 wordsScrabble in Spanish: no wordScrabble in Italian: no wordScrabble in German: no wordScrabble in Romanian: no word
 
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