How many letters does the top answer for “plane or flat on one side, and conical on the other. grew.” have?

The most common answer is planoconical (12 letters).

Crossword clue: plane or flat on one side, and conical on the other. grew.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

planoconical 12 letters web-def

Plane or flat on one side, and conical on the other. Grew.

plane or flat on one side, and spherical on the other. 63% similar → planoorbicular

flat on one side and concave on the other 50% similar → planoconcave

flat on one side and convex on the other 50% similar → planoconvex