Pellicle and Thin layer

Pellicle noun - Thin protective membrane in some protozoa.

Thin layer and pellicle are semantically related in film topic. In some cases you can use "Thin layer" instead a noun "Pellicle", when it comes to topics like membrane.

Pellicle and thin layer are semantically related in thing topic. You can use "Pellicle" instead a noun phrase "Thin layer", if it concerns topics such as film, membrane.