Botany. either of two female haploid nuclei, in the embryo sac of flowers, that fuse to produce a diploid nucleus, which combines with a male nucleus to form the endosperm.


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  • Polarogram

    [poh-lar-uh-gram] /poʊˈlær əˌgræm/ noun 1. the record produced by the action of a Polarograph.

  • Polarograph

    [poh-lar-uh-graf, -grahf, puh-] /poʊˈlær əˌgræf, -ˌgrɑf, pə-/ Trademark. 1. a brand name for an instrument that automatically registers the current in electrolysis at a dropping mercury electrode.

  • Polarography

    [poh-luh-rog-ruh-fee] /ˌpoʊ ləˈrɒg rə fi/ noun 1. Chemistry. the use of a to perform qualitative or quantitative analyses. /ˌpəʊləˈrɒɡrəfɪ/ noun 1. a technique for analysing and studying ions in solution by using an electrolytic cell with a very small cathode and obtaining a graph (polarogram) of the current against the potential to determine the concentration […]

  • Polaroid

    [poh-luh-roid] /ˈpoʊ ləˌrɔɪd/ Trademark. 1. a brand of material for producing polarized light from unpolarized light by dichroism, consisting typically of a stretched sheet of colorless plastic treated with an iodine solution so as to have long, thin, parallel chains of polymeric molecules containing conductive iodine atoms. It is used widely in optical and lighting […]

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