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There are 14 thirteen-letter words containing PENTA

CYCLOPENTANEScyclopentanes n. Plural of cyclopentane.
CYCLOPENTANE n. a colourless insoluble cycloalkane found in petroleum and used mainly as a solvent.
PENTABARBITALPENTABARBITAL n. a barbiturate drug with hypnotic, sedative, and anticonvulsant effects, also PENTOBARBITAL.
PENTACRINOIDSpentacrinoids n. Plural of pentacrinoid.
PENTACRINOID n. a young form of some crinoids that resembles Pentacrinus.
PENTADACTYLESPENTADACTYLE n. a pentadactyle animal, also PENTADACTYL.
PENTADACTYLICpentadactylic adj. Pentadactylous.
PENTADACTYLIC adj. having five digits, also PENTADACTYL, PENTADACTYLE, PENTADACTYLOUS.
PENTADELPHOUSpentadelphous adj. (Botany) Of a flower or plant: having its stamens fused together at least partly by the filaments so…
PENTADELPHOUS adj. having five bundles of stamens; united in five bundles.
PENTAHYDRATESpentahydrates n. Plural of pentahydrate.
PENTAHYDRATE n. a hydrated compound containing five moles of water per mole of the compound; a hydrated species containing five water molecules.
PENTAPEPTIDESpentapeptides n. Plural of pentapeptide.
PENTAPEPTIDE n. a polypeptide that contains five amino acid residues.
PENTAPLOIDIESPENTAPLOIDY n. the state of being pentaploid.
PENTASTICHOUSpentastichous adj. (Botany) Having, or arranged in, five vertical ranks.
PENTASTICHOUS adj. arranged in five rows.
PENTASYLLABICpentasyllabic adj. Having five syllables.
PENTASYLLABIC adj. having five syllables.
PENTAVALENCESPENTAVALENCE n. the condition of having a valency of five, also PENTAVALENCY.
UNREPENTANCESUNREPENTANCE n. lack of repentance.
UNREPENTANTLYunrepentantly adv. In an unrepentant way.
UNREPENTANT adv. not repentant.

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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