[pen-tuh-gram] /ˈpɛn təˌgræm/
a five-pointed, star-shaped figure made by extending the sides of a regular pentagon until they meet, used as an occult symbol by the Pythagoreans and later philosophers, by magicians, etc.
a star-shaped figure formed by extending the sides of a regular pentagon to meet at five points
such a figure used as a magical or symbolic figure by the Pythagoreans, black magicians, etc
“five-pointed star,” 1820, from Greek pentagrammon, noun use of neuter of adj. pentagrammos “having five lines,” from pente “five” (see five) + gramma “what is written” (see grammar).
[pen-tuh-hee-druh n] /ˌpɛn təˈhi drən/ noun, plural pentahedrons, pentahedra [pen-tuh-hee-druh] /ˌpɛn təˈhi drə/ (Show IPA) 1. a solid figure having five faces. /ˌpɛntəˈhiːdrən/ noun (pl) -drons, -dra (-drə) 1. a solid figure having five plane faces See also polyhedron
[pen-tuh-hahy-dreyt] /ˌpɛn təˈhaɪ dreɪt/ noun, Chemistry. 1. a that contains five molecules of water, as potassium molybdate, KMoO 4 ⋅5H 2 O.
[pen-tuh-hahy-drik] /ˌpɛn təˈhaɪ drɪk/ adjective, Chemistry. 1. (especially of alcohols and phenols) pentahydroxy.
[pen-tuh-hahy-drok-see] /ˌpɛn tə haɪˈdrɒk si/ adjective, Chemistry. 1. (of a molecule) containing five hydroxyl groups.