The punctuation mark "¿", which is placed at the beginning of questions in Spanish and, less commonly, Catalan.

plural of inverted exclamation point

(Canada, US) The punctuation mark "¡", which is placed at the beginning of exclamations in Spanish.

plural of inverted question mark

(biochemistry, organic chemistry) An enzyme that catalyzes the hydrolysis of sucrose into glucose and fructose (invert sugar), used by bees to produce honey and in the food industry to soften chocolate.

plural of invertase

Quality of being invertebrate.

(biochemistry) A nucleoprotein complex that causes inversion of a DNA sequence

plural of invertasome