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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question. |
cluster headache clus·ter headache (klŭs'tər)
n.
A recurring headache marked by severe pain in the eye or temple on one side of the head, usually occurring in males. Also called erythroprosopalgia, histaminic headache.
| cluster headache (klŭs'tər) Pronunciation Key
A recurring headache, most common in males, characterized by severe pain in one eye or the adjacent temple, watering of the eye, and runny nose. |