| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
chemical chem·i·cal (kěm'ĭ-kəl)
adj.
Abbr. chem.
Of or relating to chemistry.
Of or relating to the properties or actions of chemicals.
A substance with a distinct molecular composition that is produced by or used in a chemical process.
A drug, especially an illicit or addictive one.
| chemical (kěm'ĭ-kəl) Pronunciation Key
Adjective Relating to or produced by means of chemistry. Noun A substance having a specific molecular composition, obtained by or used in a chemical process. |