The avocado (Persea americana) (from Nahuatl Aguacatl: agua-kah-tl), also known as aguacate, butter or alligator pear) is a tree native to Mexico, Central and northern South America, classified in the flowering plant family Lauraceae. The name "avocado" also refers to the fruit (technically a berry) of the tree that contains an egg-shaped pit. Avocado trees were cultivated in pre-Incan settlements with archeological evidence dating to 750 B.C.

Theobromine, also known as xantheose, is a bitter alkaloid of the cacao plant, found in chocolate. It is in the methylxanthine class of chemical compounds, which also includes the similar compounds theophylline and caffeine. Despite its name, the compound contains no bromine — theobromine is derived from Theobroma, the name of the genus of the cacao tree, (which itself is made up of the Greek roots theo ("God") and brosi ("food"), meaning "food of the gods") with the suffix -ine given to alkaloids and other basic nitrogen-containing compounds.

Pomology (from Latin pomum (fruit) + -logy) is a branch of botany that studies and cultivates fruits.