- aspA water snake.
- aspidiumSynonym of dryopteris: a member of a certain genus of ferns, including the male fern.
- aspidoliteA monoclinic-prismatic mineral containing aluminum, fluorine, hydrogen, iron, magnesium, oxygen, potassium, silicon, sodium, and titanium.
- aspisA type of round shield borne by ancient Greek soldiers.
- endaspideanHaving the anterior scutes extending around the tarsus on the inner side; said of certain birds.
- exaspideanHaving the anterior scutes extending around the tarsus on the outer side, leaving the inner side naked; said of certain birds.
- holaspideanHaving a single series of large scutes on the posterior side of the tarsus; said of certain birds.
- protaspisA stage in the development of a trilobite where the creature has not yet developed articulated segments.