well formed 
adjective
1Correctly or attractively proportioned or shaped: by twenty weeks the fetus is well formed...
- His head was of the common size, to which appertained a well-formed face, a noble look, and tolerably fine eyes; in short, it appeared a borrowed head, stuck on a miserable stump.
- But he raises an interesting question - the difference between the ‘bundle of cells’ and the well-formed fetus that could survive outside of the womb.
- Her crops - beans, cucumbers, corn and melons - reached maturity about 10 days earlier than the norm and her produce was well-formed and wonderfully succulent.
1.1(Especially of a sentence or phrase) constructed according to grammatical rules: well-formed sentences...
- Though grammatically well-formed, the sentence is meaningless - that was Chomsky's point, the independence of syntax from meaning.
- True elementary arithmetic consists of all true well-formed sentences of this restricted language.
- Speech (the utterance of a well-formed sentence in a particular situation) establishes three kinds of relation to reality.
1.2 Logic Conforming to the formation rules of a logical system.When the transform is applied to a well-formed logical statement that has a certain truth value in standard analysis, the transfer principle allows us to rest assured that the transformed sentence has the same truth value....
- If human beings are capable of deciding the truth value of every well-formed mathematical statement, then classical logic will prevail after all.
- From a formal point of view, a conclusion follows necessarily from the premises in a well-formed syllogism.