Chilostomata :: Chilostomata (n. pl.) An extensive suborder of marine Bryozoa, mostly with calcareous shells. They have a movable lip and a lid to close the aperture of the cells..
Derotremata :: Derotremata (n. pl.) The tribe of aquatic Amphibia which includes Amphiuma, Menopoma, etc. They have permanent gill openings, but no external gills; -- called also Cryptobranchiata..
Dicyemata :: Dicyemata (n. pl.) An order of worms parasitic in cephalopods. They are remarkable for the extreme simplicity of their structure. The embryo exists in two forms.
Gymnolaemata :: Gymnolaemata (n. pl.) An order of Bryozoa, having no epistome..
Gymnophthalmata :: Gymnophthalmata (n. pl.) A group of acalephs, including the naked-eyed medusae; the hydromedusae. Most of them are known to be the free-swimming progeny (gonophores) of hydroids..
Gymnosomata :: Gymnosomata (n. pl.) One of the orders of Pteropoda. They have no shell.
Hackmatack :: Hackmatack (n.) The American larch (Larix Americana), a coniferous tree with slender deciduous leaves; also, its heavy, close-grained timber. Called also tamarack..
Haematachometer :: Haematachometer (n.) A form of apparatus (somewhat different from the hemadrometer) for measuring the velocity of the blood.
Haematachometry :: Haematachometry (n.) The measurement of the velocity of the blood.