Resembling or related to an acorn or to barnacles; having acorn-like characteristics.
From Greek 'balanos' (acorn) plus '-oid' (resembling or related to). The suffix '-oid' is widely used in scientific terminology to indicate similarity in form or characteristics.
The '-oid' suffix shows up everywhere in science (humanoid, asteroid, paranoid)—it lets us say 'kind of like this thing' without claiming something IS exactly that thing.
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