| FONTICULUS | • fonticulus n. Synonym of fontanelle (“membranous spot on the head of a baby”). • fonticulus n. A small artificial ulcer produced by caustics or a lancet. • fonticulus n. (Anatomy) The depression just over the top of the breastbone. |
| FULIGINOUS | • fuliginous adj. Pertaining to or resembling soot in such features as colour, texture or taste; sooty, dusky. • FULIGINOUS adj. sooty; having a dark or dusky color. |
| FULMINEOUS | • fulmineous adj. Fulminous; of or pertaining to thunder. • FULMINEOUS adj. pertaining to thunder and lightning, also FULMINOUS. |
| FUNICULARS | • funiculars n. Plural of funicular. • FUNICULAR n. a cable railway ascending a mountain. |
| FUSULINIDS | • fusulinids n. Plural of fusulinid. • FUSULINID n. any of a family of extinct marine foraminifera. |
| RUEFULNESS | • ruefulness n. The property of being rueful. • RUEFULNESS n. the state of being rueful. |
| SULFONIUMS | • sulfoniums n. Plural of sulfonium. • SULFONIUM n. the positively charged group SH3, its salts or derivatives, also SULPHONIUM. |
| UNBLISSFUL | • unblissful adj. Not blissful. • UNBLISSFUL adj. not blissful. |
| UNBOASTFUL | • unboastful adj. Not boastful. • UNBOASTFUL adj. not boastful. |
| UNFLUSHING | • unflushing adj. That does not flush. • UNFLUSH v. to lose colour. |
| UNIFLOROUS | • uniflorous adj. (Botany) Bearing a single flower. • UNIFLOROUS adj. bearing one flower only; as, a uniflorous peduncle. |
| UNSKILLFUL | • unskillful adj. Not skillful. • UNSKILLFUL adj. not skillful, also UNSKILFUL. |
| UNSULFURED | • unsulfured adj. (Chiefly chemistry) Having no added sulfur. • unsulfured adj. (By extension, of fruits, molasses, etc) Having no sulfur dioxide gas involved in production. |
| UNTASTEFUL | • untasteful adj. Not tasteful. • UNTASTEFUL adj. not tasteful. |
| UNTRUSTFUL | • untrustful adj. Not trustful. • UNTRUSTFUL adj. not trustful or trusting. |
| UNUSEFULLY | • unusefully adv. In an unuseful manner. • UNUSEFUL adv. not useful. |
| USEFULNESS | • usefulness n. The quality or degree of being useful. • USEFULNESS n. the state of being useful. |