Hypertext Webster Gateway: "Opisthobranchia"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Opisthobranchia \O*pis`tho*bran"chi*a\, Opisthobranchiata
\O*pis`tho*bran`chi*a"ta\, n. pl. [NL., from Gr. ? behind + ?
gills.] (Zo["o]l.)
A division of gastropod Mollusca, in which the breathing
organs are usually situated behind the heart. It includes the
tectibranchs and nudibranchs.
From WordNet (r) 1.7 (wn)
Opisthobranchia
n : gastropods having the gills when present posterior to the
heart and having no operculum: includes sea slugs; sea
butterflies; sea hares [syn: {Opisthobranchia}, {subclass
Opisthobranchia}]
Additional Hypertext Webster Gateway Lookup
Gateway by dict@stokkie.net
stock only wrote the gateway and does not have any control over the contents;
see the Webster Gateway FAQ,
and also the Back-end/database links and credits.