Select Page

Archives: Dictionary


ˈek-tə-ˌdərm Noun 1. The outer of the three germ layers of the embryo (the other two being mesoderm and endoderm) of a metozoan animal. Ectoderm gives rise to epidermis and neural tissue. ( 2. One of the three primary germ cell layers in the very early embryo. The other two layers are the mesoderm (middle layer) and endoderm (most proximal layer), with the ectoderm as the most exterior (or distal) layer. It emerges first and forms from the outer layer of germ cells. ( 3. The outer cellular membrane of a diploblastic animal (as a jellyfish). (Merriam – adj.,...

Read More


ek-ˈtō-pē-ə Noun 1. A displacement or malposition of an organ or other body part. Most ectopias are congenital, but some may happen later in life. ( 2. Abnormal position of a part or organ (especially at the time of birth). ( See also...

Read More


/ekˈtäpik/ Adjective 1. Being out of place, having an abnormal position. ( 2. Relating to ectopia. ( 3. An event occurring at an incorrect or undesirable location. Pertaining to or characterised by ectopia. (   Noun, pl. ectopics 4. An ectopic pregnancy. (Google Dictionary) Word origin: From Ancient Greek ἐκτόπιος (ektopios, “away from a place, out of place, out of the way”), from ἐκ (ek, “out”) + τόπος (topos,...

Read More

Struggling in Biology?

Are You Premed?

Confused about the MCAT? Not sure how to prepare? This guide will show you how