Definition

A stage in early embryonic development in placental mammals, characterized by a hollow ball of cells that will eventually form the embryo and other structures necessary for development.

Example

The blastocyst implants itself into the uterine wall to begin the process of pregnancy.

Conversation

Have you heard about the development of a blastocyst in early pregnancy?

Yeah, it’s fascinating how it forms the basis for embryonic development.

I read that it has an outer layer called the trophoblast, which is really interesting.

Exactly! That layer plays a crucial role in forming the placenta.

Synonyms & Antonyms

Root Explanation

Blastocyst → It is formed from "blasto-" (from Greek "blastos", meaning germ or sprout) and "cyst" (from Greek "kystis", meaning bladder or sac). The word "blastocyst" refers to an early stage of embryonic development characterized by a hollow ball of cells, resembling a sac containing the germ of the future organism.

Memory Tip

Think of a 'germ' or 'sprout' ('blasto-') inside a 'sac' ('cyst') — that's what a blastocyst is, an early stage of development containing the beginnings of life.

Visually Confused Words