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a combining form occurring in loanwords from Greek, meaning “five” (Pentateuch); on this model, used in the formation of compound words (pentavalent).
combining form
five: pentagon, pentameter, pentaprism

word-forming element meaning “five, containing five,” from Greek penta- (before a vowel pent-), comb. form of pente “five,” related to Aeolian pempte (see five), with -a- by analogy of hepta-, ennea-, deka-.

penta- or pent-


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  • Pentachloronitrobenzene

    [pen-tuh-klawr-oh-nahy-troh-ben-zeen, -ben-zeen, -klohr-] /ˌpɛn təˌklɔr oʊˌnaɪ troʊˈbɛn zin, -bɛnˈzin, -ˌkloʊr-/ noun, Chemistry. 1. a crystalline compound, C 6 Cl 5 NO 2 , used as an herbicide and insecticide. Abbreviation: PCNB.

  • Pentachlorophenol

    [pen-tuh-klawr-uh-fee-nawl, -nol, -klohr-] /ˌpɛn təˌklɔr əˈfi nɔl, -nɒl, -ˌkloʊr-/ noun, Chemistry. 1. a white, crystalline, water-insoluble powder, C 6 Cl 5 OH, used chiefly in fungicides, disinfectants, and wood preservatives. /ˌpɛntəˌklɔːrəˈfiːnɒl/ noun 1. a white crystalline water-insoluble compound used as a fungicide, herbicide, and preservative for wood. Formula: C6Cl5OH

  • Pentacle

    [pen-tuh-kuh l] /ˈpɛn tə kəl/ noun 1. . 2. a similar figure, as a hexagram. /ˈpɛntəkəl/ noun 1. another name for pentagram n. 1590s, from Medieval Latin pentaculum “pentagram,” a hybrid coined from Greek pente “five” (see five) + Latin -culum, diminutive (or instrumental) suffix. OED notes other similar words: Italian had pentacolo “anything with […]

  • Pentad

    [pen-tad] /ˈpɛn tæd/ noun 1. a period of five years. 2. a group of five. 3. the number five. 4. Chemistry. a pentavalent element or group. 5. Climatology. a period of five consecutive days. /ˈpɛntæd/ noun 1. a group or series of five 2. the number or sum of five 3. a period of five […]

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