As nouns the difference between terms and splenial
is that terms is while splenial is splenial bone.
As an adjective splenial is
relating to the splenium, especially describing the pair of muscles, at the back of the neck, that move the head and neck.
terms
English
Noun
(head)
Statistics
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splenial
English
Adjective
(-)
Relating to the splenium, especially describing the pair of muscles, at the back of the neck, that move the head and neck