biscuit

1. (UK, Australia, Ireland, New Zealand, sometimes Canada, rare in the US and the Philippines) A small, flat, baked good which is either hard and crisp or else soft but firm; a cookie.Examples: "Weighed myself at the gym and have hit 10st 8lb, a sure sign of things getting out of control—so I can’t even console myself with a chocolate biscuit."AustraliaCanadaIrelandNew-ZealandUKcountableraresometimesuncountable

2. (chiefly Canada, US, rare in Scotland and Guernsey) A small, usually soft and flaky bread, generally made with baking soda, which is similar in texture to a scone but which is usually not sweet.CanadaUScountablerareuncountable

3. (UK, Ireland, Philippines, Singapore, Malaysia) A cracker.Examples: "cheese and biscuits"; "water biscuits"; "digestive biscuits"IrelandMalaysiaPhilippinesSingaporeUKcountableuncountable

4. (especially nautical) Any of several hard bread or breadlike foodstuffs, especially those formerly supplied to naval ships and armies, made with very little water, kneaded into flat cakes, and slowly baked, and which often became infested with weevils.Examples: "Near-synonyms: tack, bread"; "He was a long, earnest man, and though born on an icy coast, seemed well adapted to endure hot latitudes, his flesh being hard as twice-baked biscuit."countableespeciallyuncountable

5. (woodworking) A thin oval wafer of wood or other material inserted into mating slots on pieces of material to be joined to provide gluing surface and strength in shear.Synonyms: dowel, finger joint, glue strip, splinecountableuncountable

6. (US, slang) A plastic card bearing the codes for authorizing a nuclear attack.UScountableslanguncountable