1. Unfamiliar word : felidae
Part of speech : Noun ( proper noun)
Definition/Meaning : Felidae is a family of mammals in the order Carnivora, colloquially referred to as cats, and constitutes a clade. A member of this family is also called a felid. The term "cat" refers both to felids in general and specifically to the domestic cat (Felis catus).
2. Unfamiliar word : Predynastic period
Part of the speech: Noun (proper noun)
Definition/Meaning:The Predynastic Period of Ancient Egypt (prior to 3100 BC) is traditionally the period between the Early Neolithic and the beginning of the Pharaonic monarchy starting with King Narmer.
3. Unfamiliar Word:hypothesis
Part of speech: Noun(common noun)
Definition/Meaning : A hypothesis is something more than a wild guess but less than a well-established theory.
4.Unfamiliar Word: fertility
Part of speech: Noun(common noun)
Definition/Meaning:the ability to conceive children or young.