| ypsiliform | <biology> Resembling the in appearance; said of the germinal spot in the ripe egg at one of the stages of fecundation. Origin: Gr. The name of the letter. Source: Websters Dictionary (01 Mar 1998) |
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| ypsiloid | <anatomy> In the form of the letter Y; Y-shaped. Source: Websters Dictionary (01 Mar 1998) |
| YPT1 protein geranylgeranyltransferase | <enzyme> Modifies saccharomyces cerevisiae secretory GTPase protein ypt1 Registry number: EC 2.5.1.- Synonym: geranylgeranyltransferase ypt1 protein, ggtase II (26 Jun 1999) |