AMNIOTIC SAC By N., Sam M.S. - 2 a membrane filled with liquid that surrounds the embryo of a reptile, mammal, or bird, and keeps it safe. AMNIOTIC SAC: "Often, rupturing the amniotic sac once a woman is in active labor will speed things up a great deal." Related Psychology Terms HEARING PMDD: Can It Be Cured? PRENATAL DEVELOPMENT LYSERGIC ACID (LSD) HYPERMNESIA APRAXIA (literally, “inability to act or do”) REACTION TIME (Response Latency) ATARACTIC (Atanndc) SOCIAL CLASS (Social Stratification) NERVE CONDUCTION Cite this page: N., Sam M.S., "AMNIOTIC SAC," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/amniotic-sac/ (accessed December 5, 2021).