| Subject | English | German |
| industr., construct. | black opal | Scharzer Opal |
| chem. | black opal | schwarzer Opal |
| opt. | cased opal | Milchüberfangglas |
| opt. | cased opal | überfangenes Milchglas |
| construct. | cast opal glass | Farbtrübglas |
| construct. | cast opal glass | Marblit |
| coal., chem. | common opal | gemeiner Opal |
| met. | ferruginous opal | Eisenopal |
| met. | ferruginous opal | Jaspopal |
| met. | fire-opal | Feueropal |
| met. | fire-opal | Sonnenopal |
| industr., construct. | fire opal | Feueropal |
| met. | flame-opal | Sonnenopal |
| met. | flame-opal | Feueropal |
| industr., construct., met. | flashed opal | Opalüberfangtafelglas |
| opt. | flashed opal | überfangenes Milchglas |
| opt. | flashed opal | Überfangtrübglas |
| industr., construct., met. | flashed opal | Opalüberfangglas |
| industr., construct., chem. | fluoride opal glass | fluorgetrübtes Glas |
| mining. | glass opal | Hyalit |
| industr., construct. | gold opal | Goldopal |
| met. | harlequin opal | Harlequin |
| met. | jasper opal | Eisenopal |
| met. | jasper opal | Jaspopal |
| industr., construct. | mass opal | Opal-Masse |
| met. | noble opal | Edelopal |
| met. | noble opal | edler Opal |
| gen. | opal blue | Opalblau |
| el. | opal bulb | Opalglaskolben |
| el. | opal bulb | Trubglaskolben |
| tech. | opal bulb | Trübglaskolben |
| gen. | Opal-crowned | Opalscheitelpipra |
| ornit. | opal-crowned manakin | Opalscheitelpipra (Pipra iris) |
| ornit. | opal-crowned manakin | Opalpipra (Pipra iris) |
| gen. | Opal-crowned Tanager | Opalscheiteltangare |
| ornit. | opal-crowned tanager | Opalscheiteltangare (Tangara callophrys) |
| tech. | opal glass | Opalglas (Pla) |
| tech. | opal glass | Trübglas |
| construct. | opal glass | Mattglas |
| gen. | opal glass | Opalgläser |
| gen. | opal glass | Milchglas |
| pack. | opal glass | Beinglas |
| industr., construct. | opal glass chippings inlaid in cement | in Moertel eingelassene Splitter aus Alabasterglas |
| gen. | opal glass door | Milchglastür |
| gen. | opal glass pane | Milchglasscheibe |
| opt. | opal glass screen | Mattscheibe |
| gen. | opal glass window | Milchglasfenster |
| el. | opal lamp | Truebglaslampe |
| el. | opal lamp | Opalglaslampe |
| gen. | opal lamp | Opallampe |
| construct. | opal lamp bulb | Opalglasleuchte |
| construct. | opal lamp bulb | Opalglasglühbirne |
| gen. | opal-like | opalartig schillernd |
| gen. | opal-like | opaleszierend |
| ornit. | opal manakin | Opalscheitelpipra (Pipra iris) |
| ornit. | opal manakin | Opalpipra (Pipra iris) |
| industr., construct. | opal matrix | Opal-Matrix |
| construct. | opal rock | opalhaltiges Gestein |
| construct. | opal rock | Opal |
| gen. | Opal-rumped Tanager | Rotbauchtangare |
| ornit. | opal-rumped tanager | Rotbauchtangare (Tangara velia) |
| ornit. | opal tanager | Rotbauchtangare (Tangara velia) |
| industr. | opal-wax | hydriertes Rizinusöl |
| industr. | opal-wax | Opalwachs (hydriertes Rizinusöl) |
| chem. | opal-wax | hydriertes Rizinusoel |
| industr., construct., chem. | phosphate-opal glass | Phosphat-Opalglas |
| opt. | pot-opal glass | Milchglas |
| industr., construct., met. | pot-opal glass | hafenfertiges getrübtes Opalglas |
| mining. | prase opal | Prasopal |
| met. | precious opal | Edelopal |
| met. | precious opal | edler Opal |
| mining. | water opal | Hyalit |
| industr., construct. | water opal | Wasseropal |
| met. | white opal | Milchopal |
| industr., construct., chem. | white phosphate opal | Mondscheinglas |
| industr., construct., chem. | white phosphate opal | Knochenglas |
| industr., construct., chem. | white phosphate opal | Beinglas |
| met. | wood-opal | Holzopal |