bohr theory: (physics) a theory of atomic structure that combined Rutherford's model with the quantum theory; electrons orbiting a nucleus can only be in certain stationary energy states and light is emitted when electrons jump from one energy state to another
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
aril: fleshy and usually brightly colored cover of some seeds that develops from the ovule stalk and partially or entirely envelopes the seed