Abdominalia (n.)
definition: A group of cirripeds having abdominal appendages.

Abdominalia is an 11 letter word that begins with an A and ends in an A

Abracadabra (n.)
definition: A mystical word or collocation of letters written as in the figure. Worn on an amulet it was supposed to ward off fever. At present the word is used chiefly in jest to denote something without meaning; jargon.

Abracadabra is an 11 letter word that begins with an A and ends in an A

Abranchiata (n.)
definition: A group of annelids
So called because the species composing it have no special organs of respiration.
Abranchiata is an 11 letter word that begins with an A and ends in an A

Albuminuria (n.)
definition: A morbid condition in which albumin is present in the urine.

Albuminuria is an 11 letter word that begins with an A and ends in an A

Algarovilla (n.)
definition: The agglutinated seeds and husks of the legumes of a South American tree (Inga Marthae). It is valuable for tanning leather
And as a dye.
Algarovilla is an 11 letter word that begins with an A and ends in an A

Allantoidea (n.)
definition: The division of Vertebrata in which the embryo develops an allantois. It includes reptiles
Birds and mammals.
Allantoidea is an 11 letter word that begins with an A and ends in an A

Amenorrhoea (n.)
definition: Retention or suppression of the menstrual discharge.

Amenorrhoea is an 11 letter word that begins with an A and ends in an A

Amphisbaena (n.)
definition: A fabled serpent with a head at each end
Moving either way.
Amphisbaena is an 11 letter word that begins with an A and ends in an A

Amphisbaena (n.)
definition: A genus of harmless lizards
Serpentlike in form without legs and with both ends so much alike that they appear to have a head at each and ability to move either way. See Illustration in Appendix.
Amphisbaena is an 11 letter word that begins with an A and ends in an A

Amphitrocha (n.)
definition: A kind of annelid larva having both a dorsal and a ventral circle of special cilia.

Amphitrocha is an 11 letter word that begins with an A and ends in an A

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