(mathematics) A complex analytic function satisfying a certain kind of functional equation with respect to the group action of the modular group, and also satisfying a growth condition.

(obsolete) Contraction of they are.

(biochemistry, genetics) An artificial human theta-defensin shown to be effective against HIV and other viruses.

The act of making a joint. / The set of joints so produced. / (uncountable) The characteristic of having joints. / The initial grinding of the teeth of a cutting tool, prior to sharpening.