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There are 16 thirteen-letter words containing I, L, 2N, 2O, P and R

CLINOPYROXENEclinopyroxene n. (Mineralogy) Any pyroxene that has a monoclinic crystal structure.
CLINOPYROXENE n. a member of the pyroxene group of minerals having a monoclinic crystal structure, such as augite, diopside, or jadeite.
DINITROPHENOLdinitrophenol n. (Organic chemistry) Any of six isomeric aromatic compounds C6H3OH(NO2)2 formed by the nitration of phenol;…
DINITROPHENOL n. any of six isomeric crystalline compounds some of whose derivatives are pesticides.
INOPPORTUNELYinopportunely adv. In an inopportune manner.
INOPPORTUNE adv. inconvenient, unseasonable.
INTERPOLATIONinterpolation n. (Music) An abrupt change in elements, with continuation of the first idea.
interpolation n. (Mathematics, sciences) The process of estimating the value of a function at a point from its values at nearby points.
interpolation n. (Computing) The process of including and processing externally-fetched data in a document or program; see interpolate.
MELANOTROPINSmelanotropins n. Plural of melanotropin.
MELANOTROPIN n. a hormone secreted by the pituitary gland which stimulates the production of melanin by melanocytes.
MICROPLANKTONmicroplankton n. Microscopic zooplankton.
MICROPLANKTON n. very small plankton.
NONRECIPROCALnonreciprocal adj. Not reciprocal; not returned in kind.
NONRECIPROCAL adj. not reciprocal.
NUCLEOPROTEINnucleoprotein n. (Biochemistry) Any complex of a nucleic acid and a protein.
NUCLEOPROTEIN n. a compound that consists of a protein (as a histone) conjugated with a nucleic acid (as a DNA) and that is the principal constituent of the hereditary material in chromosomes.
PARALIPOMENONparalipomenon n. (Biblical) Either of the Books of Chronicles in the Old Testament.
paralipomenon n. (Usually in the plural) An omission, especially one of a book, added later as a supplement.
PARALIPOMENON n. a thing added as a supplement to a main text, also PARALEIPOMENON.
PHILODENDRONSphilodendrons n. Plural of philodendron.
PHILODENDRON n. any of various aroid plants cultivated for their showy foliage.
PREDNISOLONESprednisolones n. Plural of prednisolone.
PREDNISOLONE n. a drug similar to cortisone, used as an anti-inflammatory, also PREDNISONE.
PROLONGATIONSprolongations n. Plural of prolongation.
PROLONGATION n. the act of prolonging.
PRONOMINALISEPRONOMINALISE v. to make into or treat as a pronoun, also PRONOMINALIZE.
PRONOMINALIZEpronominalize v. (Transitive) To give the effect of a pronoun to.
PRONOMINALIZE v. to make into or treat as a pronoun, also PRONOMINALISE.
SCOLOPENDRINEscolopendrine adj. (Zoology) Like or pertaining to the Scolopendra.
SCOLOPENDRINE adj. like a centipede of the family Scolopendridae.
SPOROPOLLENINsporopollenin n. (Botany) A combination of biopolymers, observed in the exine layer of the spore and pollen wall.
SPOROPOLLENIN n. a polymer that comprises the exine (outer layer of the wall) of spores and pollen grains.

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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See this list for:

  • English Wiktionary: 101 words
  • Scrabble in French: 40 words
  • Scrabble in Spanish: 20 words
  • Scrabble in Italian: 57 words
  • Scrabble in German: no word
  • Scrabble in Romanian: 62 words


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