Index of English words, starting with "th"

(1) - Theoretical (a.) Pertaining to theory; depending on, or confined to, theory or speculation; speculative; terminating in theory or speculation: not practical; as, theoretical learning; theoretic sciences.

(1) - Theoretics (n.) The speculative part of a science; speculation.

(1) - Theorist (n.) One who forms theories; one given to theory and speculation; a speculatist.