firstshape
nounUK /ˈfɜːstʃeɪp/
US /ˈfɜːrstʃeɪp/
The very first shape you make or see.
The baby drew a circle as her firstshape on the paper.
OTHER MEANINGS
2. The earliest version of a design or model.
The clay firstshape was rough, but the final statue was smooth.
3. The basic outline from which other shapes are made.
Cut the firstshape from cardboard, then trace it for the rest.
4. A shape that appears before all others in a pattern.
In this puzzle, the firstshape is always a triangle.