1. firm and stable in shape; not liquid or gas
2. having no holes or empty spaces inside
3. reliable and dependable

1. a substance that is firm and stable in shape

Examples

• Ice is water in its solid form.
• The table is made of solid wood.
• She gave me solid advice about my career.
• He worked for three solid hours without a break.
• The bridge has a solid foundation.
• The scientist studied how liquids turn into solids.
• We need solid evidence to prove our case.
• The solid rock wall blocked our path.