Achondroplasia

Achondroplasia-n
a genetic disorder in which cartilage fails to develop into bone at the early stages of development, resulting in dwarfism

Achondrite

Achondrite-n
a stony meteorite that does not contain rounded grains (chondrules)

Achiral

Achiral-adj
used to describe a molecule that does not have left-handed or right-handed configuration (chirality)

Achlorhydria

Achlornhydria-n
an absence of or reduction in hydrochloric acid in the gastric juice

Acheron

Acheron-n
in Greek mythology, one of the rivers that ran through Hades

Acheulian

Acheulian-n
a period of the Paleolithic era druing which people made symmetrical stone hand axes

Achene/Akene

Achene/Akene-n
a dry single-seeded fruit that does not open to release its seed. Dandelions and sunflowers have achenes.