Dactylology :: Dactylology (n.) The art of communicating ideas by certain movements and positions of the fingers; -- a method of conversing practiced by the deaf and dumb.
Dactylonomy :: Dactylonomy (n.) The art of numbering or counting by the fingers.
Dactylopterous :: Dactylopterous (a.) Having the inferior rays of the pectoral fins partially or entirely free, as in the gurnards..
Dactylotheca :: Dactylotheca (n.) The scaly covering of the toes, as in birds..
Dactylozooid :: Dactylozooid (n.) A kind of zooid of Siphonophora which has an elongated or even vermiform body, with one tentacle, but no mouth. See Siphonophora..
Didactylous :: Didactylous (a.) Having only two digits; two-toed.
Discodactylous :: Discodactylous (a.) Having sucking disks on the toes, as the tree frogs..
Heterodactylous :: Heterodactylous (a.) Having the first and second toes turned backward, as in the trogons..
Zygodactylous :: Zygodactylous (a.) Yoke-footed; having the toes disposed in pairs; -- applied to birds which have two toes before and two behind, as the parrot, cuckoo, woodpecker, etc..