[1] : The Collaborative International Dictionary of English v.0.48

etheostomoid \e`theos"tomoid\, a. nl. etheostoma name of a
   genus + -oid. zo"ol.
   pertaining to, or like, the genus etheostoma. -- n. any
   fish of the genus etheostoma and related genera, allied to
   the perches; -- also called darter. the etheostomoids are
   small and often bright-colored fishes inhabiting the fresh
   waters of north america. about seventy species are known,
   including the rare snail darter percina tanasi, 3
   inches long, found only in the tennessee river and classified
   as a threatened species. see darter.
   1913 webster
see also:
etheostoma darter snail darter percina tanasi threatened species darter 

[2] : WordNet (r) 2.0

snail darter
     n : 3-inch snail-eating perch of the tennessee river syn: percina
         tanasi
see also:
percina tanasi 

Snail Darter >> S Words
Snail Darter, definition of term: Snail Darter
snail+darter_pag1.html

Darter >> D Words
Darter, definition of term: Darter
darter_pag1.html

Snail >> S Words
Snail, definition of term: Snail
snail_pag1.html

Snail Mail >> S Words
Snail Mail, definition of term: Snail Mail
snail+mail_pag1.html

Sea Snail >> S Words
Sea Snail, definition of term: Sea Snail
sea+snail_pag1.html