دلهمQ. 4 اِدْلَهَمَّ It (the night) was, or became, black; (TA;) or intensely dark: (Mgh:) and اِدْلَأَمَّ signifies the same; (K and TA in art. دلم;) the ء being a substitute for ه. (TA in that art.) And It (darkness) was, or became, dense, or thick. (K.) See the next paragraph. b2:  Also He (a man) was, or became, aged; and so اِدْلَهَنَّ. (K in art. دلهن.) دَلْهَمٌ Dark. (K.) You say لَيْلٌ دَلْهَمٌ Dark  night: (TA:) and ↓ لَيْلَةٌ مُدْلَهِمَّةٌ A dark night. (S, TA.) b2:  And Deprived of his reason by love: (K:) a signification which shows the م to be augmentative; for it is from الدَّلَهُ: or, accord. to IKtt and others, the ل in ↓ ادلهمّ is augmentative; for, they say, it is from الدُّهْمَةُ: either opinion is allowable. (TA.) b3:  Also The wolf. (K.) b4: And The male of [the bird called] the قَطَا [like دَيْلَمٌ]. (K.) دِلْهَامٌ A man who is penetrating, sharp, vigorous, and effective. (K.) b2:  And A lion. (K.) مُدْلَهِمٌ Densely black. (TA.) And أَسْوَدُ مُدْلَهِمٌ Intensely black. (Lh, K.) See also دَلْهَمٌ. b2: فَلَاةٌ مُدْلَهِمَّةٌ [A desert, or waterless desert,] in which are no signs of the way. (TA.)