9-letter words starting with pen
- pentolite — a high explosive consisting of pentaerythritol tetranitrate and TNT.
- pentosans — any of a class of polysaccharides that occur in plants, humus, etc., and form pentoses upon hydrolysis.
- pentoside — a glycoside that, upon hydrolysis, yields a pentose
- pentoxide — an oxide containing five atoms of oxygen, as phosphorus pentoxide, P 2 O 5 .
- pentylene — any unsaturated hydrocarbon with formula C5H8
- penultima — the next to the last syllable in a word.
- penumbral — Astronomy. the partial or imperfect shadow outside the complete shadow of an opaque body, as a planet, where the light from the source of illumination is only partly cut off. Compare umbra (def 3a). the grayish marginal portion of a sunspot. Compare umbra (def 3b).
- penurious — extremely stingy; parsimonious; miserly.