opisthobranch /ə-pisˈthə-brangk/ noun and adjective (Gr branchia gills)

Opisthobranchˈia plural noun

An order of gastropods having the gills behind the heart

opisthocoelian /-sēˈli-ən/ adjective

(Gr koilos hollow) hollow or concave behind, as eg a vertebra is (also opisthocoeˈlous)

opisthodomos /op-is-thodˈə-mos/ noun

A rear-chamber in a Greek temple

opisthoglossˈal adjective

(Gr glōssa tongue) having the tongue attached in front, free behind, as in frogs

opisthogˈnathous adjective

(see -gnathous under gnathic) having receding jaws

opisˈthograph noun

A manuscript or slab inscribed on the back as well as the front

opisthographˈic adjective

opisthogˈraphy noun

opisthosōˈma noun

(Gr sōma body) the abdomen of an arachnid

opisthotonˈic adjective

opisthotˈonos noun

(Gr, drawn backwards, from teinein to stretch, pull tight) extreme arching backwards of the spine and neck as a result of spasm of the muscles in that region