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There are 8 words containing IOSTR

BIOSTROMEbiostrome n. (Geology) A horizontally bedded stratum of fossilized remains of sedentary organisms.
BIOSTROME n. a rock layer consisting of a deposit of organic material such as fossils.
BIOSTROMESbiostromes n. Plural of biostrome.
BIOSTROME n. a rock layer consisting of a deposit of organic material such as fossils.
PERIOSTRACUMperiostracum n. (Malacology) The proteinaceous outer sheath of many molluscan shells.
PERIOSTRACUM n. the horny outer layer of a mollusc's shell.
PERIOSTRACUMSPERIOSTRACUM n. the horny outer layer of a mollusc's shell.
ALLOIOSTROPHOSALLOIOSTROPHOS adj. irregularly divided, not in alternate strophe and antistrophe.
RADIOSTRONTIUMradiostrontium n. Any radioactive isotope of strontium, especially 9038Sr.
RADIOSTRONTIUM n. a radioactive isotope of strontium, esp. strontium-90.
BIOSTRATIGRAPHYbiostratigraphy n. (Biology, geology) The study of the stratigraphic distribution of fossils.
BIOSTRATIGRAPHY n. the determination of age, etc., of sedimentary strata from fossils which they contain.
RADIOSTRONTIUMSradiostrontiums n. Plural of radiostrontium.
RADIOSTRONTIUM n. a radioactive isotope of strontium, esp. strontium-90.

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.

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See this list for:

  • English Wiktionary: 37 words
  • Scrabble in French: no word
  • Scrabble in Spanish: 138 words
  • Scrabble in Italian: 120 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 9 words


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