Code coverage means, how well your test set is covering your source code. i.e. to what extent is the source code covered by the set of Test cases. As mentioned in above answers, there are various coverage criteria, like paths, conditions, functions, statements, etc.
Chiasmus. Definition: Chiasmus is a specific type of parallelism. It consists of two parallel phrases in which corresponding words or phrases are placed in the opposite order.
Strabismus is a condition in which the eyes are not aligned correctly. While one eye looks at the target, the other eye is looking in a different direction. Esotropia is a type of strabismus where the straying eye is crossed inwards. Exotropia is another type of strabismus where the straying eye is drifting outwards.