| hyalospongia | <zoology> An order of vitreous sponges, having glassy siX-rayed, siliceous spicules. Synonym: Hexactinellinae. Origin: NL, fr. Gr. Glass + a sponge. Source: Websters Dictionary (01 Mar 1998) |
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| hyalotype | A photographic picture copied from the negative on glass; a photographic transparency. Origin: Gr. Glass + -type. Source: Websters Dictionary (01 Mar 1998) |