tegument
Concise Oxford English Dictionary © 2008 Oxford University Press:
tegument /ˈtɛgjʊm(ə)nt/
▶noun chiefly Zoology the integument of an organism, especially a parasitic flatworm.
– derivatives
tegumental adjective,
tegumentary adjective.
tegumental adjective,
tegumentary adjective.
– origin ME: from L. tegumentum, from tegere ‘to cover’.
'tegument' also found in these Oxford entries:

