| mother liquor | The saturated solution remaining after a crystallization or precipitation. (05 Mar 2000) |
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| mother-of-pearl | <zoology> The hard pearly internal layer of several kinds of shells, especially. Of pearl oysters, river mussels, and the abalone shells; nacre. See Pearl. Source: Websters Dictionary (01 Mar 1998) |
| mother-of-thyme | <botany> An aromatic plant (Thymus Serphyllum). Synonym: wild thyme. Source: Websters Dictionary (01 Mar 1998) |
| mother of vinegar | In vinegar, the fungus of acetous fermentation appearing as a stringy sediment. Origin: A.S. Modder, mud (05 Mar 2000) |
| mother superior complex | The tendency of a psychotherapist to play a mothering role to the detriment of the therapeutic process. (05 Mar 2000) |
| mother surrogate | One who substitutes for or takes the place of the mother. (05 Mar 2000) |
| mother yaw | A large granulomatous lesion, considered to be the initial lesion in yaws, most commonly present on the hand, leg, or foot. Synonym: buba madre, frambesioma, mamanpian, protopianoma. (05 Mar 2000) |
| pollen mother cell | <plant biology> A diploid plant cell that forms four microspores by meiosis, the microspores give rise to pollen grains in seed plants. (18 Nov 1997) |
| surrogate mother | A woman who has been contracted with to carry a pregnancy for another woman or couple. (05 Mar 2000) |
| eel-mother | <zoology> The eelpout. Source: Websters Dictionary (01 Mar 1998) |
| endosperm mother cell | Cell of the higher plant embryo sac. Contains two polar nuclei and fuses with the sperm cell from the pollen grain. Gives rise to the endosperm. (18 Nov 1997) |