terbium — a rare-earth, metallic element present in certain minerals and yielding colorless salts. Symbol: Tb; atomic number: 65; atomic weight: 158.924; specific gravity: 8.25.
Four-or-more syllable rhymes
ytterbium — a rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb; atomic weight: 173.04; atomic number: 70; specific gravity: 6.96.
