shepherd moon
A small moon that orbits near the outer edges of a planetary ring or within gaps in the ring. The edge of the ring remains sharply defined owing to the gravity of shepherd moons.
A plant, fungus, or other organism that grows upon rock.
Any of various flying insects of the suborder Symphyta whose ovipositor is long and often serrated and is used to cut into plants to lay eggs.
Third-person singular simple present indicative form of reproach
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